0000067: Look into using "externals" in subversion to coordinate different packages

Notes
(0000077) marki (administrator) 2011-04-07 14:02	Externals seems aimed at building a single directory structure from a set of separately controlled directories. It is especially important when a particular directory structure is necessary to either build or use the code. We are using calib as a stand-alone directory and in our case we want to retain the ability to mix and match versions of calib and sim-recon. Also the relative position of the calib and sim-recon directories is not critical; it does not require strict enforcement. Further, incorporating calib as a sub-directory of sim-recon is a complication whose need will disappear when a database is used. It would probably be better to avoid this complication and linkage of trees whose purpose is quite different. Simple tagging of calib versions would be simpler and do the job.

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