[mythtv] Portable backend, was MacOS X partial backend implementation

[Nigel Pearson]

> What I think would be interesting is a "portable" backend.  (ie for 
> laptops).  This backend would do no recording on its own, but simply 
> copy files from a master backend as well as the needed database info 
> so that mythtv can be used on the road when there is no contact with 
> the master backend.

	Very interesting idea, Geoff. This could be done one of two ways:

1) Implement a new backend program (mythportablebackend? mythpback?)
    Not impossible, but implementing the MySQL API might be tedious,
    and keeping all the Myth protocols up to date with the real
    backend is a bit of a maintenance pain.
    I thought about this in the early days of the Mac frontend port,
    when I was catching a train to/from work and thus was away from
    a backend to test against

2) Use the current mythbackend with a local MySQL
    and a database modified from the real one.
    The patches I included should let you build a mythbackend
    binary, and a few shell or Perl scripts could be hacked to
    select programs, copy them, and insert relevant local
    database entries

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