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/python-fix-mremap.diff

@@ -0,0 +1,25 @@
+$NetBSD: patch-at,v 1.2 2008/08/30 10:02:33 tron Exp $
+
+The first change is part of the fix for CVE-2008-2315 taken from Gentto.
+
+--- Modules/mmapmodule.c.orig	2006-08-22 14:57:07.000000000 +0100
++++ Modules/mmapmodule.c	2008-08-30 10:16:13.000000000 +0100
+@@ -223,7 +223,7 @@
+ 		return(NULL);
+ 
+ 	/* silently 'adjust' out-of-range requests */
+-	if ((self->pos + num_bytes) > self->size) {
++	if (num_bytes > self->size - self->pos) {
+ 		num_bytes -= (self->pos+num_bytes) - self->size;
+ 	}
+ 	result = Py_BuildValue("s#", self->data+self->pos, num_bytes);
+@@ -449,6 +449,9 @@
+ 
+ #ifdef MREMAP_MAYMOVE
+ 		newmap = mremap(self->data, self->size, new_size, MREMAP_MAYMOVE);
++#elif defined(__NetBSD__)
++                newmap = mremap(self->data, self->size, self->data, new_size, 0);
++
+ #else
+ 		newmap = mremap(self->data, self->size, new_size, 0);
+ #endif