Major infrastructure changes, part 2.

* Moved helpers, common and triggers dirs into xbps-src, where
  they belong.
* Renamed the templates dir to srcpkgs, it was so redundant before.
* Make it possible to add subpkgs with no restriction in names, for
  example udev now has a subpkgs called "libgudev". Previously
  subpkgs were named "${sourcepkg}-${pkgname}".
* xbps-src: changed to look for template files in current directory.
  That means that most arguments from the targets have been removed.
* xbps-src: added a reinstall target, to remove + install.
* xbps-src: do not overwrite binpkgs by default, skip them.

And more that I forgot because it's a mega-commit that I've been
working for some days already...

--HG--
extra : convert_revision : 0f466878584d1e6895d2a234f07ea1b2d1e61b3e

srcpkgs/python/patches/python-2.6-gdbm.patch

@@ -0,0 +1,11 @@
+--- setup.py	2008-09-30 10:15:45.000000000 +1000
++++ setup.py	2008-12-07 16:04:01.000000000 +1000
+@@ -1013,7 +1013,7 @@
+                 if self.compiler.find_library_file(lib_dirs, 'ndbm'):
+                     ndbm_libs = ['ndbm']
+                 else:
+-                    ndbm_libs = []
++                    ndbm_libs = ['gdbm', 'gdbm_compat']
+                 exts.append( Extension('dbm', ['dbmmodule.c'],
+                                        define_macros=[('HAVE_NDBM_H',None)],
+                                        libraries = ndbm_libs ) )