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Add support for git sparse checkout

Added a new, optional external property, sparse. sparse points to a file (relative to external repository local directory) with git sparse checkout patterns (e.g., directory names to include).
If the sparse keyword is included, enable sparse checkout for that repository and use git read-tree to perform the sparse checkout.

Added a new test for sparse checkout. The test is a repo with two externals which are both tag2 of the simple_ext repo with one of them configured for a sparse checkout. The test makes sure that both externals have the correct files.

Updated the documentation for the externals configuration file.

User interface changes?: Yes
New sparse keyword is optional with a blank default value which preserves current functionality.

Fixes: #120

Testing:
test removed: None
unit tests: All passed
system tests: All passed, including new test for sparse feature
manual testing: Several manual tests of NASA test cases.

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