Added date time picker to Mappicker

Added datepicker and time picker (Which looks ugly)
to the mappicker dialog.
Changes made:
1. Added the date time pickers to mappicker
2. Shifted the divename dialog to PickLocationMap activity
   to fix change of context, as pointed out by Aurelein
3. Added default dive name for current dive add.

Signed-off-by: Venkatesh Shukla <venkatesh.shukla.eee11@iitbhu.ac.in>