ixchat: bump to 3.0.2
add docbook-xml (instr. from BLFS)
add docbook-xsl (instr. from BLFS)
add xmlto
add asciidoc
add git-man

since git's manpages require a ton of xml bloat (asciidoc,
xmlto, libxml2, libxslt,python, docbook-xml, docbook-xsl),
we provide them as a separate pre-generated download.

to create them manually, install asciidoc package and issue
make man
make install-man
in the git source tree.

closes #130