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Merge pull request #83 from jedwards4b/jedwards/components_arg

add a components arg to checkout only select components

Add optional argument to only process components listed on the command line
checkout_externals cam clm
will only process externals associated with the listed components cam and clm.
Also added a test of the new functionality.

User interface changes?: Yes
An additional command line option was added, previous functionality continues to be supported

Fixes: #80

Testing:
test removed:
unit tests: all pass
system tests:
manual testing: Tested with lists of components in Externals.cfg and with ones that were not there.

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