nicer ray parameter functions

Adds the following functions:

void dGeomRaySetFirstContact (dGeomID g, int firstContact);
int dGeomRayGetFirstContact (dGeomID g);
void dGeomRaySetBackfaceCull (dGeomID g, int backfaceCull);
int dGeomRayGetBackfaceCull (dGeomID g);

...for consistency and cleaner API. The following should be depreciated (and preferably removed later):

void dGeomRaySetParams (dGeomID g, int FirstContact, int BackfaceCull);
void dGeomRayGetParams (dGeomID g, int *FirstContact, int *BackfaceCull);

No significant changes to internal code.

(submitted by Martijn Buijs)

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