this change makes the DQSegDBInstall command a bit more standalone, and a bit more robust, by having it take care of appending the etc files to the data_files list itself, rather than having to manually specify them in the `setup()` call

M2Crypto isn't available for python3

Glue is the wrong package because in pypi, glue is not the ligo glue package.  Once Leo's suggested changes to Glue are reviewed, we can add back in ligo-glue as a pypi requirement.  That will require new w

    - this should enable user env scripts whilst not breaking bdist

This reverts commit 00d0a64d.

This reverts commit 9b90adf3.

    - writes etc/dqsegdb_user_env.{sh,csh} to set PATH and PYTHONPATH

    - utils/version.py trolls git info to generate dqsegdb/version.py
    - added .gitignore with basic information
    - setup.py generates version information and installs with
      dependency tracking