Mega patch to improve how build dependencies are handled and

how packages are found.

First: I removed all these *-deps.db files and only a single file
is used now "build-depends.db"; it's smaller and will be easier
to handle in the future... when "run-depends.db" is added :-)

Second: there's no need to specify version of package anymore;
before you had to do:

	$ pkgfs.sh install git-1.6.0.2

now you only do:

	$ pkgfs.sh install git

This will read the variables located at PKGFS_TEMPLATESDIR/git.tmpl
and will the install the version that is there.

--HG--
extra : convert_revision : 9e3e5d70965a69c76f59e322b7c7b674d627af52

templates/libxml2.tmpl

@@ -0,0 +1,12 @@
+# Template build file for 'libxml2'.
+pkgname=libxml2
+version=2.7.1
+extract_sufx=".tar.gz"
+url=http://xmlsoft.org/sources
+build_style=gnu_configure
+make_cmd="$PKGFS_MASTERDIR/bin/gmake"
+pkgconfig_override="libxml-2.0.pc"
+short_desc="XML parser library from the GNOME project"
+maintainer="Juan RP <xtraeme@gmail.com>"
+checksum=4de3732c39efa95b63abbd60dbb74357075faf63
+long_desc="..."