Generalize the line harvesting infrastructure.
Natural consequences of previous refactor
Add more harvesters
Three things:
 (1) push allocrate/memfootprint through
 (2) switch to bulkImportRows again and add checking
 (3) wire up the unit test for real
Track the server-side columns and do some work to be robust to changes
in the schema.  New columns are added as needed and reordering is tolerated.
Unknown columns are tolerated too, but they get empty values for the uploaded rows.
Bump version.  Breaking change to uploaded data:
get rid of those pesky Just's!  Also, bumped the dependencie
on handa-gdata because of new createColumn method.
Reenabled fields that were disabled just to shorten URL length
Submodule update