Multiple help-related changes - Make every command's POD doc have a single-line introductory description. This help is then used as a one-liner summary in Term::Shell. - Tie %cmd_map to IxHash to preserve hash elements' order. - Fix bug in Term::Shell's code related to command aliases. (Also emailed Term::Shell author to include the fix in next release.) - Remove run_() which already exists in Term::Shell. - Use Term::Shell's help facilities instead of manually redefining run_help() and other related commands. The complete POD documentation is still available for viewing if user invokes ./shelldap --help. - Completer functions are disabled right now (fix coming in the next commit)

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