Reinstate autocommit for mysql databases

 - Add the autocommit statement to the mysql db object constructor
   (CrawlDBI.py)
 - Update the successful insert test to fail if autocommit is disabled
   (test_CrawlDBI.py)

Version:   2014.1112.4
Change-Id: Id576e5e44a9c3b9b9a1678e775ff5d5dcf3ad9fa
Store COS min and max sizes as text, not int

 - Max sizes are already too big for an int and pushing the size of mysql
   bigints. So we're just going to store the max and min COS sizes as a
   text string of decimal digits. (dbschem.py, cv_lib.py)

Version:   2014.1112.5
Change-Id: Ibdfa22c7129e4b7c56fc329e6b3157d30d9b5c70
Update dbschem.drop_table messages to omit table prefix

 - Required some tweaks to tests

Version:   2014.1112.6
Change-Id: I639300a9876358cb3f9ebe442d665ba8a603a008
2014.1112.7
More test fixes for omitting table prefix

Version:   2014.1112.7
Change-Id: Id4f616c2047e3d5d668b0642a202fc746abbbb87
Give the user a function for managing the lscos table

 - Added subfunction 'lscos' to cv.py
 - Added supporting routine cv_lib.lscos_show()
 - Tweaks to cv_lib.ls_populate()
 - New entries in messages.py

Version:   2014.1112.8
Change-Id: I00aeab3e569ca3caa546adc9264373fc2d933571