Backport Lars's fix for bug removal in GCC 4.7

Backport Lars's fix for bug removal in GCC 4.7

A long standing bug has been fixed in GCC 4.7, the bug was a non-
sactioned extra lookup. This caused some code to work that really
shouldn't.

The fixes are: add this->, Class::, or move functions about
as required to fullfill the rules.

In this case some template instantiations were movee to after what
they reference.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/branches/BRANCH_2_0_X@40583 a592a061-630c-0410-9148-cb99ea01b6c8