upsimage.cgi(8): update GD homepage
FAQ: minor updates

Update the bestfortress entry, fix the mythicbeasts URL, and reword a few
entries.
NUT QA document: CR->LF
NUT QA document: updated and reworded
HCL: various updates

* Closes https://github.com/networkupstools/nut/issues/107
* http://lists.alioth.debian.org/pipermail/nut-upsdev/2013-November/006564.html
* http://news.gmane.org/find-root.php?message_id=50D9D460.1080408%40gmail.com
* http://news.gmane.org/find-root.php?message_id=CA%2b4duQ%3dppW%2bPz%2bRVPVXJyFLj0HErh1ZOtm5tk8b6n5Nd5kSk0g%40mail.gmail.com
* http://news.gmane.org/find-root.php?message_id=528EC53C.9000801%40me.com