Siepic-ebeam-pdk

- ring Monte Carlo; using point-coupled model for interpolation; Sparam model for the nominal design simulation.

- Ring resonator CML update

- GUI for the Monte Carlo simulations

- Added Monte Carlo for the directional coupler used for ring resonators
- automated S-parameter generation for both nominal design simulation, and for Monte Carlo

Updates to the Monte Carlo simulation.
- Please install the latest version of INTERCONNECT (Feb 2016 version).
- Please update the CML. The file should be ebeam_v1.2_2016_02_19.cml. In the Design kits section in INTERCONNECT, you should see a folder v1.2.2016_02_19 if it is correctly installed.
- Please update the scripts for KLayout. In the SiEPIC menu, you should see "Lumerical INTERCONNECT - WtW Monte Carlo simulations"

To run a Monte Carlo simulation:
- Add one laser, and at least one detector.
- To speed up performance, it is recommended that you copy and paste one circuit at a time into a new layout.
- Verify your circuit.
- perform a single simulation to make sure it works
- "Lumerical INTERCONNECT - WtW Monte Carlo simulations". This performs Wafer to Wafer variability simulations.


Minor improvements:
- non-Manhattan WG check
- Path to Waveguide hierarchy-check
- SiEPIC configure, short-cut keys, settings
- Strict pin connection verification / extraction
- Updating waveguide loss values (WG and Bragg)