* src/GrampsDb/_ReadXML.py: remove commented out code
* src/Editors/_EditEvent.py: handle overwriting of date text
* src/RelLib/_DateBase.py: allow optional dropping of date text on
serialization
* src/RelLib/_Date.py: allow optional dropping of date text on
serialization
* src/RelLib/_Event.py: allow optional dropping of date text on
serialization
svn: r7306