Respect the G

The G is co-maintainer now, so give him the cred. Will
make him famous!
Create Task dialog: fix button order

Use dialog button box to get the correct Ok/Cancel order
depending on the platform.
Nitpick: "OK", not "Ok"
Connect to clicked() signal, not pressed()

clicked() is the signal to use for buttons, not
pressed().
Merge pull request #123 from frankosterfeld/work/make-g-comaintainer

Respect the G
Merge pull request #121 from frankosterfeld/work/buttons

Work/buttons
Merge pull request #122 from frankosterfeld/work/clicked

Connect to clicked() signal, not pressed()
Show week numbers in date pickers

That actually makes sense for every occurence of QDateEdit. Especially
when manually creating events inside the event editor window this is really helpful.

Note that this is disabled by default in QDateEdit (see usage of
QCalendarWidget::setVerticalHeaderFormat inside QCalendarPopup::verifyCalendarInstance()
inside qdatetimeedit.cpp). Not sure why, probably because the majority of users of
QDateEdit don't need that feature(?).
Merge pull request #126 from krf/weeknumbersindatepickers

Show week numbers in date pickers