When SQLConnectionPool is not specified in the models
Settings.config file, MiddleKit eventually runs out of
The 'proper' way to fix this would be to have MiddleKit
close connections when SQLConnectionPool is not set.
But until then... this patch provides a sane default
for the SQLConnectionPool size when its not specified.
Without this patch, a site with two ObjectStores will
get the 'Too many connections' error after about 100