[ET Trac] [Einstein Toolkit] #1832: Rewrite git handling in Formaline

[Einstein Toolkit]

#1832: Rewrite git handling in Formaline
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 Reporter:  eschnett               |       Owner:                     
     Type:  defect                 |      Status:  new                
 Priority:  minor                  |   Milestone:                     
Component:  EinsteinToolkit thorn  |     Version:  development version
 Keywords:                         |  
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 Handle git repositories in a single script, vastly simplifying the code.
 This also correct several error or inconsistencies along the way.

 - tar files are no longer recored in git (they lead to very large
 repositories)
 - the code is now serial (since git is serial anyway), so that locking the
 repo is no longer necessary
 - use the flesh's TAR variable instead of looking for tar
 - correct paths returned by "find" (git is picky about double slashes)

 See <https://bitbucket.org/cactuscode/cactusutils/pull-requests/4/handle-
 git-repositories-in-a-single-script/diff>.

 Fixes #1830.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1832>
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