ExternalProject: add LOG_DIR option that allows overriding of log location
In some situations it can be helpful to separate out the location of the log files from the location of the stamp files. For instance if you have a continuous integration that exposes the location where log files are stored. This commit adds an option that allows a user to override the default behaviour of putting the log files in STAMP_DIR called LOG_DIR. The previous behaviour of putting the log files into the STAMP_DIR applies if LOG_DIR is not specified.
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