Add and use gnome autoconf macros. Fix lots of new compiler warnings. git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@2842 57a11ea4-9604-0410-9ed3-97b8803252fd
git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@2277 57a11ea4-9604-0410-9ed3-97b8803252fd
git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@2171 57a11ea4-9604-0410-9ed3-97b8803252fd