removed unused "load" option on Document.
added a "mode" option. At the moment only 'permissive' value is hounour.
Only fixup missing namespace declaration for 'permissive'


git-svn-id: https://ilk.uvt.nl/svn/sources/libfolia/trunk@17688 12f355fe-0486-481a-ad91-c297ab22b4e3