rpn 6.2.0

Experimental support for mpath plotting functionality using the new operators, 'plot', 'plot2', 'plotc'. These operators are not supported in the Windows installer.

'quit' is now an alias for 'exit' in interactive mode and help mode.

Improvements in function definition. 'y' and 'z' are now operators, allowing for defining functions on 2 or 3 variables.

Operators 'eval2' and 'eval3' allow for evaluation of 2 and 3 variable operators.

rpn now throws an error if a user-defined function is invalidly specified, instead of going into an infinite loop.

'filter' allows filtering a list based on a user-defined function.

If the units in a measurement cancel out, then the measurement is converted back to a numerical value.

Added 'rand_' and 'randint_' operators.

Added the 'debruijn' operator.

Fixed several minor bugs.

rpn 6.1.0

New operators: 'maxdouble', 'maxfloat', 'mindouble', 'minfloat'

Base conversion for output is no longer limited to 1000 digits. There's no reason to do that.

'rpn 0 cf' now throws an error rather than dividing by 0.