#15 make opengaim coexist with gaim

[Todd Vierling]

This means filename changes. It may be ideal to use
the --program-prefix mechanism to do this, defaulting
to "open", but with the ability to set it to empty so
that filenames match Gaim's.

[Jerry Kilpatrick]

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I think this is crutial before one can start making packages.

Perhaps add a configure option that reverts 'back' to just
gaim, for those who want it. But we don't want opengaim
packages overwriting gaim packages especially when people
will expect it to be called opengaim.

[Todd Vierling]

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Partially implemented in 0.76b. The Perl modules still get
the "Gaim::" name at the moment.