* src/DateDisplay.py (verify_format): Correct check.
* src/Date.py (is_regular): Add method to detect exact single
non-empty dates; (set): Add text string as an optional argument.
* src/DateEdit.py: Use DateHandler instead of low-level DateDisplay;
(check): Display yellow LED for anything other than regular dates.
svn: r3562
* src/Gregorian.py: removed
* src/Hebrew.py: removed
* src/Julian.py: removed
* src/calendars/Islamic.py: removed
* src/calendars/Persian.py: removed
* src/calendars/Makefile.am: removed
* src/Date.py: New, simpler date structure
* src/DateHandler.py: Start of a class to abstract and select
parser and display functions based off locale
* src/DateParser.py: base date parsing class (US English)
* src/DateDisplay.py: base date display class (US English)
* src/DateEdit.py: handle new date method
* src/EditPerson.py: handle new date method
* src/EventEdit.py: handle new date method
* src/GrampsCfg.py: removed redundant options due to new date class
* src/StartupDialog.py: removed redundant options due to new date class
* src/Makefile.am: handle file changes
* src/Sort.py: handle new date method
* src/ReadGedcom.py: handle new date method
* src/ReadXML.py: handle new date method
* src/WriteGedcom.py: handle new date method
* src/WriteXML.py: handle new date method
* src/RelLib.py: handle new date method
* src/gramps_main.py: handle new date method
* src/gramps.glade: handle new date method
svn: r3546
