Peter Scheibel 9c16b4a7f6 Allow uninstalling missing packages (#11874) ... Remove package access from directory_layout; add regression test to ensure that specs can be uninstalled without a package being known		2019-06-29 16:04:15 -07:00
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spack	Allow uninstalling missing packages (#11874)	2019-06-29 16:04:15 -07:00