Spelling fixes in comments and docs, provided by Kjartan Maraas in bug 657336.
-gdbusmessage.c and gregistrysettingsbackend.c is updated to fix C99-style declarations -also fixed typo for displaying registry entry in gregistrysettingsbackend.c (\% -> \\%)
'n' and 'q' types had their signed/unsigned meaning inverted.