class HTransF: public HTrans<float>

 HTrans is a 4x4 transformation matrix for homogeneous coordinates
 stored internaly in a column-major order to allow direct usage by
 GL. The element type is Double32_t as statically the floats would
 be precise enough but continuous operations on the matrix must
 retain precision of column vectors.

 Direct  element access (first two should be used with care):
 operator[i]    direct access to elements,   i:0->15
 CM(i,j)        element 4*j + i;           i,j:0->3    { CM ~ c-matrix }
 operator(i,j)  element 4*(j-1) + i - 1    i,j:1->4

 Column-vector access:
 USet Get/SetBaseVec(), Get/SetPos() and Arr[XYZT]() methods.

 For all methods taking the matrix indices:
 1->X, 2->Y, 3->Z; 4->Position (if applicable). 0 reserved for time.

 Shorthands in method-names:
 LF ~ LocalFrame; PF ~ ParentFrame; IP ~ InPlace