Bug 1409546: Add framework option to add/edit collection form

And centralising the checks for collection can_have_framework() and
has_framework()

And making sure that one cant change framework if competencies exist
for the current framework

Change-Id: I5918c4e3f463388a0b03511eb9ef7adc24babcec
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>