New "kira hrdiag" command allows turning it on/off, setting plot ranges.
"kira int x" is a synonym for "kira int x=x", the common case.
New "sqrtmass" attribute.  "mass" is again in linear, not log units.
Disable kira display if we don't get a valid input file.
XXX Bogusly import getfloats() from partibrains.c; should go in a separate
utility .c/.h file.