Allow NSE_TYPE_CONNECT_SSL to be canceled.

This fixes a really bad bug that seems to have been there for a while. Canceling
a nsock connect SSL operation fails with fatal(). I have never seen it in real
life though.

Added a corresponding unit test.
Replace the current list of checks with a is_valid_path function.
Whitespace.
Disallow any backslashes.
Change the comment.
Reorder the checks a bit.
Change the comment.
Replace some of the rules with per-directory ones.
Fix French man page for Nmap, corrections reported by Antoine MÉRIC.
Add request from Jacek Wielemborek
Add a very small todo item
Normalize script author fields

Clean up some typos and differences. Most have been normalized to
whatever form of the name occurred in the largest number of scripts.
Paulino was contacted directly and requested his email be added to all
of his credits.
Add .gitignore
Initial work on NNTP capability gathering.
Add google-search-appliance script.
Try disabling TLSv1 to get some SSLv3-only servers to work.
Optional matches are cheaper than empty alternative matches.
Some pending work, part 2.
Add HP iLO2 telnet match. Update HP iLO telnet match.
Add survivor remote agent (permission denied)