new port liblouisxml: Braille transcription services for xml documents

[boris.dusek@…]

Please comment and/or commit.

I also explicitely ask for review of two things:

1. the line "depends_build port:pkgconfig". The library searches for libxml2 and liblouis using pkgconfig. I don't know which port then should depend on pkgconfig - whether the ones that are declaring their existence using pkgconfig (like libxml2 and liblouis), or the ones that use pkgconfig to find other libraries (liblouisxml).

2. I also encountered problem with filesystem:

Warning: violation by /opt/local/info Warning: violation by /opt/local/man Warning: liblouisxml violates the layout of the ports-filesystems!

I solved this (after consulting Raim in IRC) by adding the line "configure.args --mandir=${prefix}/share/man --infodir=${prefix}/share/info". But I wonder why MacPorts does not pass these arguments itself since it supports autoconf-based systems out-of-the-box and should know these dark corners (so that portwriters don't have to take care of them in every port).

Thanks.