FET - Free Timetabling 6.28.5

Improved the divide year by categories dialog, as suggested by Vangelis Karafillidis: added the option to copy the categories and divisions from another students year, and added the option to make the first category permanent. On this occasion there was corrected a possible crash bug in this dialog.

Updated to Qt 6.5.2.
The activities import/export from/to CSV files will now process correctly the individually modified subactivities. The different components will be separated by the | symbol. Suggested by ngoctp29121982 and Volker Dirr.
Corrected a few English fields, by Vangelis Karafillidis.
Updated the Greek translation, by Vangelis Karafillidis.

Important generation bug fix, when using constraints of type students (set) max span per (real) day. This bug was found with the help of Vangelis Karafillidis. Unfortunately, this bug fix means that the generation might take longer (for the contrived example FET-5-official/Romania/Pedagogic-High-School-Tg-Mures/2007-2008_sem1-d-test-students-max-span-per-d
ay.fet the generation time might be even with 50% longer on average). But the algorithm is correct now and hopefully on real-life examples the behavior will be better; for this same contrived example, cycling (which is very very bad), which appeared when locking the activities to days, is not a problem anymore.
Bug fixes in the interface: when modifying the number of hours per half day in the Mornings-Afternoons mode, the constraints of type 'max span per real day' were forced to reduce their maximum span to the number of hours per half day, not to the number of hours per real day.
Added two new types of constraints for the Terms mode: activities min in a term and max terms between activities (suggested by mikkojoo).
Added a new example file from Algeria, by Benahmed Abdelkrim.

Обновлено до версии Qt 6.2.0.
Улучшения в новом ограничении, введенном в предыдущей версии (учитель(и) не более трех дней подряд).
Исправления незначительных ошибок интерфейса.

Crash bugs fixed, when using the constraints teacher(s) max two activity tags from N1, N2, and N3 (in the Mornings-Afternoons mode) and there were activities having none of these tags. Reported by Mohamed Ait Ichou. Other minor bugs were fixed in these constraints (the description of the constraints, and an activity should not have more than one tag from these three, if using these constraints relating to its teacher(s)).

Crash bugs fixed when using Qt 5.15.2, reported by ghani1990. The exact locations with wrong code were found using gdb.
Bug fix: the program was using some uninitialized variables (discovered with Valgrind). But this did not affect the generation.

Bug fix when importing the teachers from a CSV file in the mornings-afternoons mode. This bug would eventually lead to a crash (assertion failed) when viewing the teachers list. Reported by Khineche Kaddour.

Code improvements and cleanup (including one improvement suggested by Volker Dirr, found using Coverity Scan).

Corrected a compilation error on 32-bit platforms (reported by Zsolt Udvari).
Code cleanup (suggested by Volker Dirr, found using Cppcheck).

Slightly improved the code for the constraints of type teacher(s)/students (set) max days per week and teacher(s)/students (set) interval max days per week.
Corrected a compilation warning appearing with the new gcc 10.1.1.
Updated the Arabic translation, by Benahmed Abdelkrim.

Changed the random number generator to a better one, MRG32k3a, by Pierre L'Ecuyer (used with permission). This has a longer period but, unfortunately, on some older/not so powerful computers/platforms (especially the 32-bit ones), this new random number generator might run (much) slower. But the generation time should be generally nearly the same or comparable, since the random numbers generation routine seems to take only about 3% of the generation time.
Bug fix for the future Qt versions: Qt reverted back from the signal QComboBox::currentIndexChanged(int, const QString &) used in their snapshot to the signal QComboBox::currentIndexChanged(int). The combo boxes should work now correctly with the future versions of Qt.
Code cleanup

Updated to Qt 5.13.2.
Code cleanup.
Added two new example files from Syria, by Zafar Allah Askar.

Various rare but important bug fixes concerning the new feature of virtual rooms.
Small memory leak bug fixed (when reading incorrect files with virtual rooms).
Minor fixes and improvements.
Added a new example file from Greece, by dimzev.

- Code update: removed the dependency of the obsolete Qt 'foreach' keyword (suggested by Volker Dirr). The speed of generation is improved by 5%-25%, depending on the data file. Now you need a C++11 compliant compiler to compile FET.
- Updated the German example files from secondary school 1, by Volker Dirr.
- Updated all the example files to use the latest file format.

Updated to Qt 5.11.0.
Corrected a few compilation warnings that appeared in FET when using the new Qt 5.11.0.
Code cleanup (by Volker Dirr).
Improved the command-line operation on Windows (since this platform misses/ignores SIGTERM, we use instead SIGBREAK to write the current and highest-stage timetables, then stop the program). Suggested by svenvanhal.

Minor strings bugs fixed (reported by Innocent De Marchi).
Updated the Turkish translation, by Yakup Kadri Demirci, who is the new translator.
Updated the Greek translation, by Vangelis Karafillidis.
Updated the Japanese translation, by Taro Tada.

Minor corrections in the Romanian translation

Improved the activity planning dialog. Now the user can swap the teachers of one or more activities.
Added the possibility of exporting the data and the timetable as CSV (comma separated values) files from the command line version of FET

Updated the Spanish translation
Code cleanup