Dramatically changed the approach to this PR

Changes include:
- pager is no longer a settable parameter which can be changed by the end user at runtime
- The cmd2.Cmd class now has two different attributes:
    - pager
        - contains command-line command to use to display wrapped text using a pager
        - By default set to PAGER environment variable if it exists
            - 'more' on Windows or 'less -RXF' on POSIX
    - pager_chop
        - contains command-line command to use to display chopped (truncated) text using a pager
        - Set to same thing as pager unless pager starts with 'less', in which case  a ' -S' gets appended
- The cmd2.Cmd.ppaged() method now has an additional optional argument "chop" which defaults to False
    - If chop is True, then self.pager_chop gets used as the pager
    - If chop is False, then slef.pager gets used as the pager

I couldn't think of any single solution which would somehow magically make all stakeholders perfectly happy.  Hopefully this is a reasonable enough compromise that everyone feels that they can get what they need without too much pain ;-)

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