New configuration scheme changes, round 1.

- Configuration file 'xbps-conf.plist' has been splitted off into
  two files: conf.plist and repositories.plist. By default they
  are stored in etc/xbps.
- Changed some members in xbps_handle struct, mostly to make it easy
  to change its value in {cache,root}dir and conffile.
- Made xbps_init() release proplib objects as soon as we don't need
  them, that way it uses 35% less of memory or in some cases even more.

There will be another commit that will implement to read new virtualpkg
settings by the user, as specified in:

	http://code.google.com/p/xbps/issues/detail?id=12

lib/package_remove.c

@@ -106,7 +106,8 @@ xbps_remove_pkg_files(prop_dictionary_t dict, const char *key)
 
 	while ((obj = prop_object_iterator_next(iter))) {
 		prop_dictionary_get_cstring_nocopy(obj, "file", &file);
-		path = xbps_xasprintf("%s/%s", xhp->rootdir, file);
+		path = xbps_xasprintf("%s/%s",
+		    prop_string_cstring_nocopy(xhp->rootdir), file);
 		if (path == NULL) {
 			rv = ENOMEM;
 			break;
@@ -194,7 +195,7 @@ xbps_remove_pkg(const char *pkgname, const char *version, bool update)
 	if (buf == NULL)
 		return ENOMEM;
 
-	if (chdir(xhp->rootdir) == -1) {
+	if (chdir(prop_string_cstring_nocopy(xhp->rootdir)) == -1) {
 		free(buf);
 		return EINVAL;
 	}