When strings are 8-bit utf8-encoded, unicode will break with the usual:
UnicodeDecodeError: 'ascii' codec can't decode byte 0xce in position ..
message. ustr() will have better luck in those cases.
Conflicts:
bin/report/render/rml2pdf/utils.py
bzr revid: p_christ@hol.gr-20101123151930-8r9q9gg7r902i2nv