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/pbzip2/patches/fix_Makefile.diff

@@ -1,32 +0,0 @@
---- Makefile.orig	2009-01-08 22:08:17.000000000 +0100
-+++ Makefile	2009-09-18 11:14:04.183561770 +0200
-@@ -15,7 +15,8 @@ CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_
- #CFLAGS += -DPBZIP_NO_LOADAVG
- 
- # Where you want pbzip2 installed when you do 'make install'
--PREFIX = /usr
-+PREFIX = $(DESTDIR)/usr
-+MANDIR = $(PREFIX)/share/man
- 
- all: pbzip2
- 
-@@ -29,15 +30,10 @@ pbzip2-static: pbzip2.cpp libbz2.a
- 
- # Install the binary pbzip2 program and man page
- install: pbzip2
--	if ( test ! -d $(PREFIX)/bin ) ; then mkdir -p $(PREFIX)/bin ; fi
--	if ( test ! -d $(PREFIX)/man ) ; then mkdir -p $(PREFIX)/man ; fi
--	if ( test ! -d $(PREFIX)/man/man1 ) ; then mkdir -p $(PREFIX)/man/man1 ; fi
--	cp -f pbzip2 $(PREFIX)/bin/pbzip2
--	chmod a+x $(PREFIX)/bin/pbzip2
--	ln -s -f $(PREFIX)/bin/pbzip2 $(PREFIX)/bin/pbunzip2
--	ln -s -f $(PREFIX)/bin/pbzip2 $(PREFIX)/bin/pbzcat
--	cp -f pbzip2.1 $(PREFIX)/man/man1
--	chmod a+r $(PREFIX)/man/man1/pbzip2.1
-+	install -d $(PREFIX)/bin
-+	install -d $(MANDIR)/man1
-+	install -m 755 pbzip2 $(PREFIX)/bin/pbzip2
-+	install -m 644 pbzip2.1 $(MANDIR)/man1/pbzip2.1
- 
- clean:
- 	rm -f *.o pbzip2