Removing old history

The LArSoft repositories must be cleaned up before they can be migrated to github. We are taking the opportunity to remove old history.

• In the case of the core repositories, we are removing the very old svn history.
• Some of the newer repositories retain history from before they were forked from a parent repository. That history will be removed.
• Not all repositories need this cleanup.
• Git commit hashes will change when this is done.
• This step will be done immediately before migrating the repositories from redmine to gitub.

• Estimated cleanup in terms of size and commits

repo	before	after	before	after
	size	size	commits	commits
larana	18M	17M	6521	1266
larcore	27M	27M	6032	777
larcorealg	29M	18M	903	732
larcoreobj	2.3M	2.2M	163	163
lardata	19M	18M	6893	1638
lardataalg	99M	99M	416	416
lardataobj	1.3M	1.2M	545	543
lareventdisplay	17M	16M	6246	990
larevt	17M	16M	5930	674
larexamples	16M	15M	5786	530
larg4	0.4M	0.4M	151	150
larpandora	19M	18M	6177	919
lareco	31M	30M	11899	6629
larsim	2000M	86M	7027	1770
larsoft	19M	18M	6521	1263
larsoftobj	0.6M	0.5M	297	297
larwirecell	0.8M	0.7M	364	363