ExternalProject: option LOG_MERGED_STDOUTERR to combine stdout and stderr
In some circumstances the user of ExternalProject may not desire the split log files for stdout and stderr. In particular with a project has many errors it can be difficult to correlate the output error with the command that it resulted from. This commit adds the LOG_MERGED_STDOUTERR option that when enabled outputs into a unified <name>-<step>.log for each step. If disabled it will default to the previous behaviour of <name>-<step>-out.log and <name>-<step>-err.log.
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