Windows rounding error fixes

Converting float (microns) to int (nanometers, dbu), use the new function:

from SiEPIC.extend import to_itype
to_itype(value, dbu)

e.g.,

from SiEPIC.extend import to_itype
to_itype(12.131, 0.001)
12131

simply dividing by 0.001 doesn't always return the correct answer.

GSiP CML updates, Spice export

v0.3.13

v0.3.13

GSiP fix

v0.3.12

Update __init__.py

GSiP in SiEPIC-Tools, migration util, fixes

• adding generic silicon photonics (GSiP) technology to this package; removing from SiEPIC-EBeam-PDK
• updates to the ring modulator transceiver example
• electrical pins can now be either box or simple_polygon
• version number in the menu title
• fix for DC Sources working in netlist import in INTERCONNECT
• added new functionality to migrate ROUND_PATH waveguides from SiEPIC-EBeam-PDK pre 0.1.41 layouts to SiEPIC-Tools

fixes and error checking for Lumerical integration

v0.3.10

 fixes and error checking for Lumerical integration

FDTD & INTERCONNECT simulations

• new feature: FDTD simulations of components.

Fix for Windows without INTERCONNECT

removed dependancy on package 'Windows_Python_packages_for_KLayout'.

Moved Windows files to Package: Windows_Python_packages_for_KLayout

v0.3.7

moved to Package: Windows_Python_packages_for_KLayout

Windows_Python_packages_for_KLayout

v0.3.6b

update

Fixes for Windows INTERCONNECT integration

v0.3.6

v0.3.6