This is a major update to the dparams api - I think it is now much cleaner and the app-side is much easier to use. hi...

Original commit message from CVS:
This is a major update to the dparams api - I think it is now much cleaner and the app-side is much easier to use.

highlights are:
- GParamSpecs are now used throughout to define dparams
- currently limited to supporting types gfloat, gint and gint64. this should cover 99% of cases and new types can be added in the future
- application-side api is now based almost entirely on setting object properties
- the smoothing dparam is now a subclass of GstDParam
- array-mode is not yet implemented but is not forgotton

time to start documenting