@Override
	protected void cleanupMerge() {
	}
Returns one of the four programs involved in the merge as indicated by the version.

@param version
           the program version to return. (LATEST, MY, ORIGINAL, or RESULT).
@return the indicated program version or null if a valid version isn't specified.
@see MergeConstants
Ghidra/Features/Base/src/main/java/ghidra/app/merge/DataTypeArchiveMergeManager.java