Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

$Id$ -> $FreeBSD$

Add html-mv script. Html-mv rename HTML generated filenames to
human readable filenames. E.g.:

$ cd FAQ
$ make FORMATS=html
$ html-mv FAQ
$ ls
FAQ_ACKNOWLEDGMENTS.html
FAQ_Any_restrictions_on_how_I_divide_the_disk_up_.html
FAQ_Are_there_any_Database_systems_for_FreeBSD_.html
FAQ_Are_there_any_commercial_high-performance_X_servers_.html
FAQ_Books_on_FreeBSD.html
FAQ_Can_FreeBSD_handle_multiport_serial_cards_sharing_irqs_.html
[...]