Version 2.5.3 - floats

There is just one update: enable floating point (FP) numbers in the expressions.

It brings three new PRAGMAs:

pragma	meaning
.pragma nofloat	all float numbers are stripped down to the integer (just drop all the digits after the decimal point)
.pragma float	leave FP numbers intact
.pragma roundfloat	all FP numbers are rounded to their nearest integer