Move gnc-gconf-utils to app-utils

This breaks the build, but this makes it easier to read the
commit history. The build will be fixed in the next commit.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@22941 57a11ea4-9604-0410-9ed3-97b8803252fd
Refactor file backend settings to no longer depend on gconf

This affects many other components as well, including the
python bindings

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@22942 57a11ea4-9604-0410-9ed3-97b8803252fd
Tests: harmonize test initialization

In particular, use qof_init instead of g_type_init. The former
calls the latter by default. Also our current engine code is
heavily dependent on gobject, so it makes sense to initialize it
as early on as possible. Having once central place to do so
will make it easier to fix this if ever we move away from gobject.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@22943 57a11ea4-9604-0410-9ed3-97b8803252fd
Bug #698781 can't build with glib 2.36: error: 'g_type_init' is deprecated

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@22944 57a11ea4-9604-0410-9ed3-97b8803252fd