Modified passthrough, adder, playondemand, float2int, int2float, and ladspa to work...

Modified passthrough, adder, playondemand, float2int, int2float, and ladspa to work with the new caps nego changes.

Original commit message from CVS:
Modified passthrough, adder, playondemand, float2int, int2float, and ladspa to
work with the new caps nego changes.

Updated adder to work with float data, now uses bytestreams.

Updated ladspa to work in any M sinkpads by N srcpads configuration, M > -1 and
N > 0. Also updated ladspa to work as a loop-based element using bytestreams for
MxN configurations other than M == N == 1 or M == 0.