Add tab completion of ISIS commands and arguments for bash users.

[ascbot]

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Author Name: Stuart Sides (@scsides)

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The current tab completion capabilities in ISIS only work for tcsh shells. Add tab completion capabilities for bash.

[SgStapleton]

The complete command works totally different in tcsh (where we already have logic for tab completion) and bash. This is requiring some extensive research into how to custom build tab-completions in bash.

[ascbot]

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