API clean up (part 2), plus misc changes and improvements.

- Rename regpkgs_dictionary to regpkgdb_dictionary to better describe what is is.
- Change some funcs in plist.c to return a boolean rather than int.
- Hide more internal funcs off the API.
- Simplify xbps_repository_update_pkg() and remove its second arg.
- Hide implementation details in xbps_repository_pool, now to iterate over the
  pool you have to use xbps_repository_pool_foreach and its struct
  repository_pool_index.
- Introduce xbps_{init,end}, to initialize/destroy some stuff in the library.
- Introduce xbps_dbg_printf to printf stuff for debugging purposes.
- xbps-{bin,repo}:  added -d arg to enable debugging output.
- Before checking if a config file needs to be installed or such, check that
  package contains the "conf_files" array.
- Remove obsolete dirs as well while updating packages.
- If transaction dictionary is ready remove the "missing_deps" array.

Bump XBPS_RELVER to 20101118.

--HG--
rename : lib/regpkgs_dictionary.c => lib/regpkgdb_dictionary.c

lib/Makefile

@@ -35,10 +35,10 @@ LIBFETCH_GEN = fetch/ftperr.h fetch/httperr.h
 OBJS = package_configure.o package_config_files.o package_orphans.o
 OBJS += package_remove.o package_remove_obsoletes.o package_state.o
 OBJS += package_unpack.o package_requiredby.o package_register.o
-OBJS += package_purge.o
+OBJS += package_purge.o initend.o
 OBJS += cmpver.o download.o fexec.o humanize_number.o plist.o
 OBJS += sortdeps.o util.o pkgmatch.o mkpath.o
-OBJS += regpkgs_dictionary.o repository.o repository_finddeps.o
+OBJS += regpkgdb_dictionary.o repository.o repository_finddeps.o
 OBJS += repository_findpkg.o repository_plist.o
 OBJS += repository_pool.o repository_sync_index.o
 OBJS += $(COMPAT_SRCS)