Comment 1 for bug 1209603

I've done some cosmetic changes in order to make it look like other calendars.

This class needs a complete code review, specially because Islamic calendar is absolutely uncertain. Holidays are determined by visual observation of natural events, like the full moon after another uncertain holiday. The visual observation can be affected by a cloudy weather and it changes the outcome of it.

For this reason, past years must be verified against some reliable source.
Current and future years need to be reviewed.