o Refactored shell detection into something a bit more easily-extendable, and

o   Refactored shell detection into something a bit more easily-extendable, and
    general cleanups in that department.

o   Additional docs stating when you'd use this and a more accurate description
    of what this actually does. Also enumerate the environment variables that
    are changed on import, and let the user know that if they try to be a wise
    guy and forget to define $SHELL that they'll be given Bourne commands as a
    default.

o   Much -- or rather most -- of this work was done in direct cooperation with
    mst++ who taught me more than a thing or two about how perl works as we
    discussed the shell refactoring. I merely did the typing. Thanks, mst.

git-svn-id: http://dev.catalyst.perl.org/repos/bast/local-lib/1.000/trunk@3749 bd8105ee-0ff8-0310-8827-fb3f25b6796d