Mega-commit to document the API with doxygen.

Some changes were made to the API when making the documentation:

- A few exported functions are now hidden, because they were only used
  internally in the library.
- A few exported symbols were renamed to document them better than
  previously.
- Cosmetic changes all along the way, as well as some fixes here and there.

--HG--
extra : convert_revision : xtraeme%40gmail.com-20100121021019-onbsivlrhdb7t3ou

bin/xbps-uhelper/main.c

@@ -273,7 +273,7 @@ main(int argc, char **argv)
 		if (argc != 2)
 			usage();
 
-		pkgname = xbps_get_pkgdep_name(argv[1]);
+		pkgname = xbps_get_pkgpattern_name(argv[1]);
 		if (pkgname == NULL)
 			exit(EXIT_FAILURE);
 
@@ -285,7 +285,7 @@ main(int argc, char **argv)
 		if (argc != 3)
 			usage();
 
-		exit(xbps_pkgdep_match(argv[1], argv[2]));
+		exit(xbps_pkgpattern_match(argv[1], argv[2]));
 
 	} else if (strcasecmp(argv[0], "cmpver") == 0) {
 		/* Compare two version strings, installed vs required */