xfcalendar enhancements

[Mickael Graf]

Edscott,

I just commited some changes:

- fix segv when saving appointment in another month than the current one
- clearing an appointment doesn't destroy the appointment window 
anymore, but leave it open with an empty text area.
- function remark_appointments: use of gtk_calendar_clear_marks
- change type for on_wInfo_delete_event and on_wAppointment_delete_event

Cheers
Mickael

-- 
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|Mickael Graf|mgf at bredband.net|
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|http://korbinus.fr.st        |
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