Changes compared to version 2.3

o  Matrix inversion on integer arrays with option base 1 fixed
o  PRINT USING behaviour for ! fixed
o  PRINT , separator should advance to the next zone, even if the current
   position is at the start of a zone
o  Added ip(), frac(), fp(), log10(), log2(), min() and max()
o  Fixed NEXT checking the variable case sensitive
o  Use terminfo capability cr to make use of its padding
o  LET segmentation fault fixed
o  PRINT now uses print items
o  -r for restricted operation
o  MAT INPUT does not drop excess arguments, but uses them for the
   next row
o  License changed to MIT