Bug 8489: Revise Ubuntu install files

Bug 8489: Revise Ubuntu install files

1) Changed ubuntu-pkg-check.sh to use lsb_release to determine version
   of ubuntu.{version}.packages file. If a versioned file does not
   exist, the user is warned, and ubuntu.packages is used. Told the
   user which file is being used. Caught apt-cache policy errors nicely.
   NOTE: ubuntu.packages MUST BE A COPY OF THE
   LATEST ubuntu.{version}.packages FILE!
2) Moved: ubuntu.packages -> ubuntu.10.04.packages
          ubuntu_maverick.packages -> ubuntu.10.10.packages
          ubuntu.precise.packages -> ubuntu.12.04 packages
             (last file created new, but effectively supersedes bug 8488)
3) Tweaked ubuntu.12.04.packages:
   * changed yaz3 references to yaz4
   * dropped libmysqlclient16-dev
   * changed libmysqlclient16 to libmysqlclient18
4) Copied the ubuntu.12.04.packages file to ubuntu.packages

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>