At the same time, rename the trace flags to debug flags since they have broader usage than simply tracing. This means that --trace-flags is now --debug-flags and --trace-help is now --debug-help
--HG-- extra : convert_revision : 9bc3833628d31799a7b578c450dac096a19aead3
--HG-- extra : convert_revision : 438eb74f14e6ea60bab5012110f3946c9213786e