Add support for \textsf{blah}

[Derek-Jones]

Found out that \sf is deprecated., so I switched to using \textsf{}, which means bib2xhtml has to support it ;-)

s/\\textsf(\001\d+)\{(.*)\1\}/<font face="serif">$2<\/font>/gs;# \textsf{text} -> <font face="serif">text</font>

[dspinellis]

Right! I'd appreciate a pull request, so that you get proper credit.

[Derek-Jones]

I now have an internet facing Linux machine: https://linux-hardware.org/?probe=22b5cb911a so I ought to start doing pull requests (will add support for euro and cent first).