Fix a small bug in tMatrix, rendering this constructor unusable
Add two extra ways to convert polar-coordinates to cartesian

* CALCU_COSSIN, the old way. Calculating cos/sin every time. no extra cache, big computing probs
* CACHE_COSSIN, caching sin/cos in a big look-up table. No computing, big caching problems
* USE_MATRIX  , Uses a matrix to recalculate the angle. Easier computing, chances for numeric instabilities (not tested)