Simple fitting functions always return column vectors

...

Signed-off-by: Andrew D. Horchler <adh9@case.edu>
Fixed overflow issue in Stone-Holmes fitting function

Large and small values must be multiplied by each other first before multiplying medium-sized value. There still may be accuracy issues.

Signed-off-by: Andrew D. Horchler <adh9@case.edu>
Mean period and initial condition functions handle errors better

Size of output cache checked in case an error interrupted function.

shc_lv_meanperiod also simplified a bit and delta values now scaled by beta -not sure about this.

Signed-off-by: Andrew D. Horchler <adh9@case.edu>