558cf7e40689fc18eca47bc80d34da555b5d27d5
New operations for manipulating spec and package DAGs. For specs: flatten: gather all deps to the root normalize: Merge constraints and make spec match package DAG For packages: validate_dependencies: Make sure spec constraints in package DAG are sane. Added tests for above methods. Also added beginnings of concretization logic, to turn abstract spec into a concrete one. Still need proper tests for normalize().
Description
A flexible package manager that supports multiple versions, configurations, platforms, and compilers.
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