Introduce symbolic names for constants and prepare for dependency reversal
Dependency relation defaults now to 'dependent'
Add dependencies for ets:info/{1,2} and ets:delete/1
Fix calls to logger in concuerror_deps
Cleanup the last interleaving
Don't purge a deleted module

When trying to purge a deleted module
seems to case trouble in some cases.
Print status of instrumenting files

Print a failed or done according to results.
Add `--show-output' flag

Allow instrumented programs to print to stdout
Instrument apply/3