Restore verbose mode for ImperasDV

Created by: davidharrishmc

We've lost the ability to run ImperasDV in verbose mode now that we transitioned to wsim.

It seems that we used to do it by passing OTHERFLAGS= *** to vsim in wally.do.

Some scripts such as setup.imperas.sh or sim-imperas set these as

OTHERFLAGS="+TRACE2LOG_ENABLE=1 VERBOSE=1"

I wasn't successful trying this on the questa wally.do file

Adding (or uncommenting the line with) --trace --tracemode to imperas.ic gives us the tracing back, but it would be good to be a wsim option.