Todd Gamblin db07c7f611 Spec constraints and normalization now work. ... - Specs can be "constrained" by other specs, throw exceptions when constraint can't be satisfied. - Normalize will put a spec in DAG form and merge all package constraints with the spec. - Ready to add concretization policies for abstract specs now.		2013-10-15 03:04:25 -07:00
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spack	Spec constraints and normalization now work.	2013-10-15 03:04:25 -07:00