Daily risk must now specify the parameters to use.

These parameters are populated from the default
settings read from the config file. Also, defaults
for the Monte Carlo simulations are also drawn
from the config.
Daily risk can now specify which parameters to use

The parameters can be specified as options on the
command line, or else defaults will be read from
the config file.
Daily risk can now specify Monte Carlo parameters.

These parameters will no longer be read from global
variables. They must be given when the daily risk
function is called from the command line or the GUI.

Also, I cleaned up some variable names for improved
clarity.