* src/lyxtext.h: add enum ChangeOp (ACCEPT/REJECT); add deleteEmptyParagraphMechanism()

* src/lyxtext.h: add enum ChangeOp (ACCEPT/REJECT); add deleteEmptyParagraphMechanism()

* src/text.C:
* src/text3.C:
* src/BufferView.C: adjust

* src/insets/insettext.C: acceptChanges() / rejectChanges(): fix pars_size bug introduced in previous commit; call deleteEmptyParagraphMechanism()

* src/text2.C: track changes in DEPM (I am not sure about whether this is actually useful; time will tell..); add deleteEmptyParagraphMechanism(pit_type, pit_type, bool)

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@16858 a592a061-630c-0410-9148-cb99ea01b6c8