Add missing implementation of copyFile
Create empty files for new file dataspaces
Merge branch 'master' of github.com:DaMSL/K3-Core
Don't build an engine with an external codec
Rewrite FileDataspaceTest to be standalone for debugging
Fixes to Dataspace and tests

Bring the dataspace test up to date with the Engine / Interpreter
rearrangements.  Add more tests for modifications to the dataspace that
is getting iterated over.
Merge branch 'master' of github.com:DaMSL/K3-Core