Prettify default error_logger output somewhat

The default error logger, the one in use before a more sophisticated
error logger can be installed, has rather terse output, in part because
it cannot rely on io:format.  This patch attempts to improve the error
logger within that constraint:

- Print timestamps as YYYY-MM-DD HH:MM:SS
- For error reports with format strings, just print the format string
  and the format arguments on separate lines
- For error reports with tuple lists, print each pair on a separate line

0 files changed, 0 insertions, 0 deletions