FIXED: Taper SOP

Fixed the linearity bug that caused nonlinear deformation when linear
taper and flare was both applied.

Also added an example file.
Merge branch 'dev' of https://github.com/qLab/qLib into dev
FIXED: Taper SOP

Flare become clearly additive which is reflected in the new flare factor
default of 0.

Help card added.
Merge pull request #139 from gadfly16/dev

Fixed Taper SOP's linearity problem.