Доработки в "лечении" ("зависание" загрузки на 100%)

- New `astro.coords` converts between horizontal and equatorial coordinates.

- New `astro.togast` calculates Greenwich Apparent Sidereal Time (GAST).

- `astro.getposition` no longer returns the Julian Date. It still returns a table with azimuth, altitude, right ascension and declination data.

- `astro.cdate`, `astro.gethourangle`, `astro.getposition`, `astro.hdate`, `astro.pdate`, `astro.searchaltitude`, `astro.searchhourangle`, `astro.searchriseset` now preserve the fractional part of a second if given by the user.

- `astro.hdate` returned the wrong month with dates at the end of a Hebrew year that is not a leap year. Also, edge case dates have been fixed. The Hebrew month enumeration has been changed, too, see the Agena Reference.

- Roundoff errors in `astro.pdate` have been reduced.

- Many `astro` functions issue an error if the input data is out-of-range, for example `February 30` or `latitude = 181`.