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/package_orphans.c

@@ -1,5 +1,5 @@
 /*-
- * Copyright (c) 2009 Juan Romero Pardines.
+ * Copyright (c) 2009-2010 Juan Romero Pardines.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -30,6 +30,8 @@
 #include <errno.h>
 
 #include <xbps_api.h>
+#include "xbps_api_impl.h"
+#include "queue.h"
 
 /**
  * @file lib/orphans.c
@@ -147,7 +149,7 @@ cleanup(void)
 		prop_object_release(orphan->dict);
 		free(orphan);
 	}
-	xbps_regpkgs_dictionary_release();
+	xbps_regpkgdb_dictionary_release();
 }
 
 prop_array_t
@@ -158,7 +160,7 @@ xbps_find_orphan_packages(void)
 	struct orphan_pkg *orphan;
 	int rv = 0;
 
-	if ((dict = xbps_regpkgs_dictionary_init()) == NULL)
+	if ((dict = xbps_regpkgdb_dictionary_get()) == NULL)
 		return NULL;
 	/*
 	 * Find out all orphans by looking at the
@@ -189,7 +191,7 @@ xbps_find_orphan_packages(void)
 		prop_object_release(orphan->dict);
 		free(orphan);
 	}
-	xbps_regpkgs_dictionary_release();
+	xbps_regpkgdb_dictionary_release();
 
 	return array;
 }