Implement simple topological sort algorithm for sortbydeps

Based on the "depth first search" algorithm, for more infos visit:
http://en.wikipedia.org/wiki/Topological_sorting

The previous algorithm used by sortbydeps was too slow, and to work around
it the number of steps needed to get correct result was reduced greatly.
So it produced wrong results in several cases :
1) smoke001.py
2) http://bugs.archlinux.org/task/7229

More here: http://archlinux.org/pipermail/pacman-dev/2007-April/008057.html

Signed-off-by: Chantry Xavier <shiningxc@gmail.com>
Signed-off-by: Dan McGee <dan@archlinux.org>

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