remaining effect type, it didn't make much sense to leave things
implemented in two separate files. Changes include:
* two bug fixes (the getChild() and getMat() methods were using floats
instead of shorts)
* performing clamping on input values
* implementing attributes using tp_getset
* merging Effect and Particle functions: the Particle module exists in
name only, with the Particle.New() and Particle.Get() functions
remaining for backward compatibility (they are in fact identical to
Effect.New() and Effect.Get() functions)
* update of doc/Effect.py (including remove all old references to wave
and build effects)
979c28bf06