#7 Handling units reasonably

[Benjamin Sprague]

This would take a LOT of work, but BeamGoo should
manage units reasonably - as in it should be able to
accept any units that the user inputs into the entry
box - "0.5 mm" for example, and convert it into
whatever format the output file is looking for - like
"0.005" (in meters).

This unit handling should be ubiquitous - all input and
output should DISPLAY units, *and* allow the user to
either input any units that make sense (fortnights
can't go in a box that's looking for meters, for
example), and convert output to any units that make
sense when *plotting* AND *exporting* output data.

This *MUST* go in before version 2.0. Version 1.0
should at least display the units that are being used,
by putting them in the input and output variable
descriptions. PHYSICISTS MUST KNOW WHAT UNITS THEY ARE
USING!