Load old version 1 XML files without crashing.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@23596 57a11ea4-9604-0410-9ed3-97b8803252fd
Update .gitignore to include recently added config macros.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@23597 57a11ea4-9604-0410-9ed3-97b8803252fd