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