fix DiffLastSaved

looks like vim recently changed the default window ordering for vertical
new, so update DiffLastSaved to be explicit.
update javadoc search test for new oracle docs domain
update junit test to account for new 'Skipped' output
update src test for new eclipse source validation error message
add notes to couple pydev tests regarding pre-adding a python interpreter
add gc command to eclimd
adt changed their feature id as of 23.0.0