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A function that catches exceptions, prints them to correct places and
exists.

Do the condition at one level higher.

Just ifdef out the whole makefiles.

not to refer directly to the hidden element of python

... for faster pops from position 0 of the list.

counters.py's documentation becomes more generic.  DNS-specific documentation
which was in counters.py, is added into dns.py.

DNS tests and information are moved from counters_test.py.

- DNS-specific information and behaviors are moved from counters.py.
- Xfrin/Xfrout/Notfyout use directly uses this module.

counters.py handles only non-DNS-specific information and
behaviors. And other modules use couters.py only for a non-DNS
purpose.