- Precede internal bsd.regress.mk variables with a _

- Rename old variables to be easier to read, and deprecate old
variables.  The old variables will still work, but emit warnings.
- REGRESS_SKIP_SLOW only needs to be non-empty now, not explicitly
set to 'yes'
- REGRESS_LOG can contain more than one file to append results to
- ERRORS variable can be set in Makefile to emit warnings or indicate
fatal errors.
- Add REGRESS_MAIL variable which can be set to an email address to
send results to.  Currently this only works for a full regression
run, since art doesnt want partial run results
- sync bsd.regress.mk(5) with these changes

ok art@ , also looked over by miod@

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