o Use XSLTPROC;
o Use XSLTPROC;

o use online version of the manpages/docbook.xsl to re-build manpage;

o only re-build manpage if XSLTPROC is present.

o add doc into subdirs.

sippy/rtpproxy,sippy/rtpproxy,dsanders11/rtpproxy,dsanders11/rtpproxy,sippy/rtpproxy,dsanders11/rtpproxy