Use setuptools to install Python modules

Instead of using relative imports, add support for installing the config
and db Python modules to a proper location using setuptools. Change all
git-interface scripts to access those modules from the search path.

Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

setup.py

@@ -0,0 +1,20 @@
+import re
+from setuptools import setup, find_packages
+import sys
+
+version = None
+with open('web/lib/version.inc.php', 'r') as f:
+    for line in f.readlines():
+        match = re.match(r'^define\("AURWEB_VERSION", "v([0-9.]+)"\);$', line)
+        if match:
+            version = match.group(1)
+
+if not version:
+    sys.stderr.write('error: Failed to parse version file!')
+    sys.exit(1)
+
+setup(
+    name="aurweb",
+    version=version,
+    packages=find_packages(),
+)