Added a Debug feature to log.c and a new parameter switch -d to python to replace the use of printf for debugging
Fixed issue 106 which had to do
with the fact that we want at least a minimimil model to be
calculated if the user simply hist carriage return for every
interactive command.  Now you will run one ionization and one
spectral cycle for a simple SV model.

In the process, elimianted the variable wcycle, pcycle, wcycles
and pcycles in favor of the analagous variable sin the goe
structure.