[libdc] Big patch committed

[David M. <dcm@MIT.EDU>]

I have committed my "big patch" that migrates the linux, juju, and Mac
OS X platforms to the new API for camera enumeration.  The
dc1394_find_cameras() function is now gone.  All the examples have been
updated to properly use the new enumeration method.

The net effect of this patch is actually that the library is now 300
lines of code shorter.  I guess that's a good omen that this new
approach should make everything leaner and meaner.

The API that defines platform-specific interaction is now defined in
dc1394/platform.h.  Of course, this is private to the library and is not
exposed to clients.

Platforms now simply provide a list of all firewire devices to the
library with a config ROM, and the library will sort out which are
cameras and which are not.  This simplifies most of the
platform-specific code and should make it easier to maintain.

The common enumeration routines have been split out from
dc1394/control.c and are now in dc1394/enumeration.c.

There are still some cleanups I intend to do, but they are smaller in
scope, so please feel free to commit new patches to SVN now.

Some of the things I still need to do:
 - Remove volatile quantities from the dc1394camera_t struct.
 - Make sure all public function names start with dc1394_
 - Clean up some naming inconsistencies

Some of the things I need to work with Damien and others to do:
 - Change the error handling mechanism of the library.

If you are using the SVN version of libdc1394, please give these new
changes a whirl and let me know if I've horribly broken anything.

Thanks,

David