Fixed leftover cruft from prompt handling revamp in ".bashrc".
Added "impersonate mode" shell wrapper to ".bashrc".

	* Used to wrap "bash" around another command, using "prompt -x +[COMMAND]".
	* Function "impersonate_command" can be used to extend ".[...]" command space.
	* Provides "$PS1" and "hardstatus" escape markers.
Added "task" impersonate mode to ".bashrc".