Updated the input channel layouts to store the source LFE information as well as...

Updated the input channel layouts to store the source LFE information as well as the non-LFE layout.  This is so muxavi.c can output the correct channel count for AC3 passthru for all AC3 sources.  Updated Controller.mm, scan.c and work.c to use these revised layouts.
Added a new property to the work object, to remember the source audio codec for audio work objects.  This enables encfaac to detect an 6-channel AC3 source to apply the QuickTime 6-channel audio mapping (as opposed to a DTS source, which doesn't need it).
Fixed the Dolby Pro Logic I/II downmix mappings in libdca and updated the libdca patch.  Uploaded a new set of pre-built darwin contribs (0014) with this patch applied.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@570 b64f7644-9d1e-0410-96f1-a4d463321fa5