scheibelp 6243a28da1 Don't change properties on already-installed packages (#5580) ... * edits to address issues where spack concretization attempts to set properties on already-installed specs * most added checks only need to check if the spec is concrete; they dont also need to check if the package is installed * add test to ensure that patches are not applied to an installed spec * add test to ensure that an error is detected when a dependent requests a dependency constraint which conflicts with a requested installed dependency		2017-10-05 10:33:04 -07:00
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spack	Don't change properties on already-installed packages (#5580)	2017-10-05 10:33:04 -07:00