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

xbps-src/shutils/metadata_scripts.sh

@@ -191,9 +191,9 @@ _EOF
 	case "$action" in
 	install)
 		if [ -n "${sourcepkg}" -a "${sourcepkg}" != "${pkgname}" ]; then
-			install_file=${XBPS_TEMPLATESDIR}/${pkgname}/${pkgname}.INSTALL
+			install_file=$XBPS_SRCPKGDIR/$pkgname/$pkgname.INSTALL
 		else
-			install_file=${XBPS_TEMPLATESDIR}/${pkgname}/INSTALL
+			install_file=$XBPS_SRCPKGDIR/$pkgname/INSTALL
 		fi
 		if [ -f ${install_file} ]; then
 			found=1
@@ -208,9 +208,9 @@ _EOF
 		;;
 	remove)
 		if [ -n "${sourcepkg}" -a "${sourcepkg}" != "${pkgname}" ]; then
-			remove_file=${XBPS_TEMPLATESDIR}/${pkgname}/${pkgname}.REMOVE
+			remove_file=$XBPS_SRCPKGDIR/$pkgname/$pkgname.REMOVE
 		else
-			remove_file=${XBPS_TEMPLATESDIR}/${pkgname}/REMOVE
+			remove_file=$XBPS_SRCPKGDIR/$pkgname/REMOVE
 		fi
 		if [ -f ${remove_file} ]; then
 			found=1