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

templates/glibc/patches/disable_timezone.diff

@@ -1,11 +0,0 @@
---- Makeconfig.orig	2009-06-07 06:17:04.561863100 +0200
-+++ Makeconfig	2009-06-07 06:17:43.384890260 +0200
-@@ -918,7 +918,7 @@ all-subdirs = csu assert ctype locale in
- 	      stdlib stdio-common libio malloc string wcsmbs time dirent    \
- 	      grp pwd posix io termios resource misc socket sysvipc gmon    \
- 	      gnulib iconv iconvdata wctype manual shadow gshadow po argp   \
--	      crypt nss localedata timezone rt conform debug		    \
-+	      crypt nss localedata rt conform debug		    \
- 	      $(add-on-subdirs) $(dlfcn) $(binfmt-subdir)
- 
- ifndef avoid-generated