Fixed #648

htmLawed's tidy feature seems to mangle character encodings on OS X
(Debian and Ubuntu seem to be fine though). Setting the 'tidy' parameter
to 0 (thereby avoiding the call to the broken hl_tidy() function) seems
to "solve" the issue.

For the curious, here's the source code for htmLawed():

http://www.bioinformatics.org/phplabware/sourceer/sourceer.php?&Sfs=htmLawed.php&Sl=.%2Finternal_utilities%2FhtmLawed