more work on blocktree, test_node
* fixes to test scripts
* initial check-in test_node
* initial check-in uvmedit
* UVM: renamed table to cell, string to text, added blob type
* cleaned up uvm tests
* added UVM and pickle module * removed ustore * rewrote module
* nodelang test
* test_uvm3: initial support for LMDB
* `File`: added `'tell` and `'seek` * UVM3: crunched pickled format by factor 10
* added support for pickling
* third evaluator works
* more work on test_uvm3
* added copy to UAtom
* implemented UAtom in test_uvm3
* number wrapper
* fixed localstorage for unique values
* UVM2: tuple implementation
* UVM: tables have integer support
* more work on UVM