Added container size check for joint states

[kmdalal]

This is just the addition of a small and simple safety check that is unlikely to fail for any user, however it's motivated by a user who integrated a different lander arm and didn't update JointMap. We now compare the number of actual joints to the number of known joints before iterating their containers.

In addition, one small improvement: replaced int with auto as the size type for the map. (Using auto because the actual type is long and not particularly useful).

And, incidentally, there are several lines that just have trailing whitespace removed -- this is automatically done by Emacs.

To test:

1. Start any sim world, then the ow_exec node, and run any plan that does both antenna and arm moves (e.g. ReferenceMission1) just long enough to see each move, and see that there are no errors in the ow_exec terminal.
2. (Optional) Comment out a line in JointMap in ow_autonomy/ow_plexil/src/plexil-adapter/OwInterface.cpp, build ow_autonomy, and repeat test 1. You should see the new error shorty after starting the ow_exec node.

[AstroStucky]

Performed both tests. The error triggers when it should.