Remove matlab files .m form feed character filter (added by 9938837f) by...

Remove matlab files .m form feed character filter (added by 9938837f) by correcting the bug at its source in gen_matlab_inline_doc_from_doxy_blocks.sh.

Basically, removing the -e option of echo to avoid interpreting escape characters.
Added by the way more filters of HTML tags (we don't want them in inline doc).