Update .gitignore to ignore debug/
Update libreg/inc/libreg.h to start using doxygen formatting for documentation
Update libreg/src/sim.c to for tustin output to have den[0]=1 and fix step response time calculation
Update cctest/src/ccTest.c to move ccTestRecoverPath() call to ccRun.c
Update cctest/src/ccSigs.c to refactor ccpars_global.flot_control to be ccpars_global.flot_output to match parameter name
Update cctest to generate optional debug file if GLOBAL DEBUG_OUTPUT is ENABLED