rpn 5.1.0

Added support for displaying representations of different integer
types... useful for debugging C++ when there are lots of signed/unsigned
issues.
rpn 5.2.0

Added support for downloading data from the OEIS.
rpn 5.2.1
rpn 5.2.2
rpn 5.2.3
rpn 5.2.4
rpn 5.2.5
rpn 5.3.0
rpn 5.3.1
rpn 5.4.0
rpn 5.4.1
rpn 5.4.2
rpn 5.4.3
rpn 5.4.4
rpn 5.4.5
rpn 5.5.0
rpn 5.6.0
rpn 5.6.1
rpn 5.6.2
rpn 5.7.0