starting new branch for Issue #7
Initial code for incremental builder. Incomplete.
improved incr interface and tests
Tested low-level API, initial code for high-level API
Added a TODO
Saving work
saving work again
set_mark docs
saving work. something is wrong with query still
saving work. something is wrong with query still
save work
unit tests for high-level API, fixed LL tests, added optional connection to QE
rm docs for removed file
update docs, fixes #7