** fix bug 5343 (patch from Richard, prerequisite for the other fix)
* Buffer.cpp:
- increment format to 343
* src/BufferParams.{cpp,h}:
- new param \use_default_options that allows to select/deselect
the "Other" class options defined in the layout file.
* src/frontends/qt4/GuiDocument.cpp:
* src/frontends/qt4/ui/LaTeXUi.ui:
- add GUI to set \use_default_options, display predefined options in the dialog
- update dialog correctly on class change.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@26860 a592a061-630c-0410-9148-cb99ea01b6c8