Update .gitignore.
Manpage updates/improvementss.

* Explicitly name options instead of just [options].
* Replace needless verbiage by standard macros.
* Order options alphabetically.
* Add a few cross-references.
* Minor punctuation nits.

Patch-from: Jan Stary <hans@stare.cz>
caf: avoid NULL dereference

Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
sd2: fix use-after-free

Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
src/sd2.c  Whitespace fix.