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/libpng.tmpl

@@ -0,0 +1,23 @@
+# Template build file for 'libpng'.
+pkgname=libpng
+version=1.2.32
+extract_sufx=".tar.bz2"
+url=ftp://ftp.fu-berlin.de/unix/graphics/png/src
+build_style=gnu_configure
+make_cmd="$PKGFS_MASTERDIR/bin/gmake"
+pkgconfig_override="libpng.pc"
+short_desc="Library for manipulating PNG images"
+maintainer="Juan RP <xtraeme@gmail.com>"
+checksum=72d06e89912121c17598573171e704ff6bac35a6
+long_desc="
+ Libpng was written as a companion to the PNG specification, as a
+ way to reduce the amount of time and effort it takes to support
+ the PNG file format in application programs. Most users will not
+ have to modify the library significantly; advanced users may want
+ to modify it more. The library was coded for both users.  All
+ attempts were made to make it as complete as possible, while
+ keeping the code easy to understand.  Currently, this library
+ only supports C. Support for other languages is being considered."
+
+run_stuff_before="build"
+run_stuff_before_build_file="$pkgname-runstuff-before-build.sh"