Create a CACTUS_EXE_DIR variable
Issue #653
new
CACTUS_CONFIGS_DIR allows us to have the configs directory
outside the Cactus tree (please see ticket #652). I suggest
to create a similar variable for the executables, a
CACTUS_EXE_DIR variable. It would work in the direction of
separating source code from generated executables, objects,
libraries, etc...
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