db connection pool

[Andre Wittenburg]

Hello,

i just looked at the GenericDataSource and thought it would be a nice
feature to shrink the pool size when the connections are not needed
anymore. If you all agree, imho there should be two more values in the
dtd for the data-source and GenericDataSource. 
<allow-shrinking>true/false</allow-shrinking>
<shrink-period-min>100</shrink-period-min>

What you think?

Andre