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
Description
A flexible package manager that supports multiple versions, configurations, platforms, and compilers.
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