LHCbMath, several fixes and improvements

LHCbMath, several fixes and improvements

1. fix names for python methods (sad typo)
2. add more functions for Bernstein:
   • nearest polynomial of lower degree,
   • power function
   • (long) polynomial division
   • filter noise
   • q-norm
   • provide more CPU efficient implementation of "elevate/reduce" pair
   • ...