fix crash when switching the protocol in the ProfileDetails dialog
fixed sf.net #66 Incorrect date for "Last Update"

this also modifies the date time format to use the default representation instead of the long one

https://sourceforge.net/p/fullsync/bugs/66/
drop org.vafada.swtcalendar and replace by org.eclipse.swt.widgets.DateTime; use user date format in the modification date filter