Increase the number of slack file descriptors in connect scan.
Add nmap_fo.xsl, a stylesheet to transform Nmap XML to FO.

By Tilik Ammon.
http://seclists.org/nmap-dev/2013/q1/14
https://github.com/tilikammon/nmap-to-fo/raw/master/nmap_fo.xsl at
0cf869844e.
Move nmap_fo.xsl → nmap-fo.xsl.

For uniformity with other files in this directory.
Put the usage comment at the top of nmap-fo.xsl.
Put a link to the nmap-fo.xsl github.
CHANGELOG for nmap-fo.xsl.
Add more to the CHANGELOG about slack descriptors.