TODO for gbirthday

[BUGFIX] close about-dialog with X
[BUGFIX] icons in rightclick-Menu
[TESTS] extended tests for databases
[XXX] set AdressBook for each database in constructor (?)
[FEATURE] save dialog/export birthdays
[FEATURE] backup-functions
[FEATURE] configuration window for lightning
[FEATURE] configuration window for sunbird
[FEATURE] input multiple birthdays
[FEATURE] deployment/install scripts

[NICE-TO-HAVE] get birthdays from pidgin

[OTHER_UPSTREAM_WORK] improve python2-evolution to emit contact.props.birth_date and use that instead of the vcard
