Issue #141: Some work on the FLI layer
Issue #141: Further work on FLI - can find signal handles
Issue#161: Revert debug change to member vars of VpiCbHdl
Issue#161: Remove dead code from simulatormodule
Issue#161: Push edge detection down into C++ and add test casees - Falling edge disabled for now
Issue#161: Add tests for Edge Trigger and call function correctly
Issue#161: Fix up some long running failures in edge trigger from C++
Issue#161: Change implementation callbacks to be allocated inside the implementation
Issue#161: Cleanup timers
Issue#161: Fix hanging reference to args on callbacks that lead to handle leakage in python, and couple of cleanups for turning on -O2
Issue #161: Add support for getting parameter values via VPI
Issue#161: Some small tidyups
Cleanup: Fix format error when printing a test failure
Issue#161: Bring VHPI closer to VPI. Edge change not pushed down for VHPI yet
Issue#161: Make edge tests more robust
Issue#161: VHPI value change pused down into vhpi layer
Issue#161: Load extra libs, GPI_EXTRA, at runtime to enable mixed language support