There are some problems where the gamer module is not being told
the full information about games won/lost/played and so it can
happen that it tries to write a -1 to the database.  In order to
stop this checks have been added which write watchdog statements
to alert admin!

Previously the default was done purely at database level.  Now it
is available to set within the code.

Moved the page callbacks into a new file vchess.pages.inc and
moved the utility functions into a new file vchess.utils.inc

Previously the tests were using DrupalUnitTestCase, but now
there is database io happening, so we need to do a module setup
in order for this to work.

Now there is a new function vchess_build_current_games_table() which
is used both by vchess_all_current_games() and
vchess_users_current_games() to build a consistent table
of current games, whether it is for all games or games for a particular
user.