updated most testfiles to match updated reality
made compositerepo more compatible with subrepos that have storage_policy=file, made pdfreader handle old versions of pdftohmtl better
adapt is_appendix to account for merged span elements
add sensible Store implementation to composite Direktiv repo
various regressions, py2 compat etc
better handling of fragmented OOXML tag structure
handle mislabeled docx files in dv.py, etc
better handling of notis files
avoid infinite recursion when serializing a circular graph
various fixes