ipower.icn: Program to write sequence of powers

This program generates integers in sequence.

The following options are supported:

     -v i    value to be raise to power; default 2
     -b i    beginning power; default 1
     -e i    ending power; default no end
     -i i    increment; default 1
     -l i    limit on number of powers generated; default no limit

Large integer values are not supported.