Major changes to support multiple distfiles in templates.

Each template now needs to use $distfiles that accepts the full
URL to download the distfile and old $extract_sufx is now merged
on it, but this must be separated by the '@' character. Example:

distfiles="http://www.foo.org/blah-6.2@.tar.gz
http://www.foo.org/blob-1.0@.tar.bz2"

If distfiles contains multiple files defined, $wrksrc is now
mandatory.

--HG--
extra : convert_revision : 1c3fa35f148af8323ce3cbcf5732104960de6bc4

templates/vim.tmpl

@@ -2,8 +2,7 @@
 pkgname=vim
 version=7.2
 wrksrc=vim72
-extract_sufx=".tar.bz2"
-url=ftp://ftp.vim.org/pub/vim/unix
+distfiles="ftp://ftp.vim.org/pub/vim/unix/$pkgname-$version@.tar.bz2"
 build_style=gnu_configure
 short_desc="Vim editor (vi clone)"
 maintainer="Juan RP <xtraeme@gmail.com>"