commit minor changes before new investigation into Skype compatibility problem
created HybridCam
daily commit.  see notes.txt for next steps.
minor improvements to Filters.cpp

tried to chanage the logging of vcam to be more flexible,
but gave up after discovering there is no easy way to
do this. Backed out all the changes, so only checking in
some very minor fixes.
created UpstreamCam
minor improvements in logging

about to change the way the output pin is initialized
in the MultiCam filter -- may need to back this out
about to alter MultiCamFilter::QueryInterface
changing media size of UpstreamCam
changed capabilities offered by UpstreamCam

note: the bug whereby MultiCam wasn't available in
Skype now appears to be fixed.