Add value comparison operators

[pyroscope]

• Because greater= sucks for numbers
• math.eq, math.lt, math.gt, math.ne, math.le, math.ge
• Same semantics as other math.* commands
  • maybe change (fix) semantics before the release, namely the obscure handling of nested lists after the 1st arg
  • strings (digits) or values accepted
  • operator is applied to first arg against all following args
  • default OR semantics – return on first "true"
• See also Add 'is.*' command group #58 for the more complex / general version (but this has merit on its own)