WIP: get rid of old simplifier copletely

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
WIP: got rid of Set in merger

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
WIP: optimize large deps in bunches

Works unacceptably slow, due to depend comparison.
Needs tuning.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Merge.hs: pick package version regardless to case sensivity

'Tensor-1.0.0.1' was less preferred, than 'tensor-0.3'

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>