* add extract file/dir functions, make it comply with the docs

src/pisi/package.py

@@ -6,15 +6,25 @@ class Package:
     """Package: PISI package class"""
     def __init__(self, packagefn, mode):
         self.filename = packagefn
-        self.mode = mode
+        self.mode = mode                # bu gerekli mi?
         # etc. etc.
 
     def add_file(fn):
         """add a file to package"""
 
     def extract(outdir):
-        """extract package contents to directory"""
+        """extract entire package contents to directory"""
+        extract_dir('', outdir)         # means package root
+
+    def extract_file(path, outdir):
+        """extract file with path to outdir"""
+
+    def extract_dir(dir, outdir):
+        """extract directory recursively"""
 
     def extract_PISI_files(outdir):
         """extract PISI control files: metadata.xml, files.xml,
         action scripts, etc."""
+        extract_file('metadata.xml', outdir)
+        extract_file('files.xml', outdir)
+        extract_dir('Config', outdir)