calibrate output changed

Changed the output of the calibrate function to be the parameters and
their errors.
started chncount plotting

Began implementing chncount plotting functionality.  Only handling input
so far.
removed plotting from chncount

Removed the plotting functionality from chncount. Gonna create some
other function to handle it instead.
plotspectrum added

Implemented and documented plotspectrum function.
plotspectrum handle output

Added the figure handle as an output for plotspectrum function.
peakloacte bounds + bins

Added handling of bounds to peaklocate function.
Added bins to peaklocate output structure.
typo

Fixed typo in peaklocate function.
plotresiduals implemented and documented

Implemented plotresiduals function.