TEMP: 5 workers
arcyd-tester: process 10 repositories instead of 1

Test Plan:
$ ./precommit.sh
phlsys_timer: add print_duration_context()

Make it easy to time sections of programs by wrapping in a 'with'
statement context.

Test Plan:
Used in a subsequent commit
arcyd-tester: time sections, print debug log

Tidy up the output of the program to be more relevant: timing
information on setup and processing, debug logs from processing.

Test Plan:
$ ./precommit.sh