cowdb0.11 is out

While extending lists in cowdb to support PObjects, I found a bug when forking a list. This has been fixed.

PXTable has now been replaced by PList. Less is more, but I do hate breaking backward compatibility. But all the old tests for xtable now use list and so the confidence level is higher. And it might be just a little bit less confusing--we now have only 1 hash, 1 table and 1 list.

I'm exhausted now and need a break. Later today I'll update the documentation for COODBMS and perhaps tomorrow I can start implementing the parents and children classifier sections. :-)