fix: lib/sql_io.py: put_table(): don't warn if can't create pkey, because this just indicates that a set-returning function was used. this should get rid of the last of the confusing benign warnings in the test output.

fix: lib/sql.py: flatten(): don't warn if can't create pkey, because this just indicates that a set-returning function was used

lib/sql.py: run_query_into() added add_pkey_warn param to support turning off "could not create unique index" warnings, which are sometimes benign (eg. when using set-returning functions with column-based import)

/README.TXT: Full database import: disk space: updated schema size (315GB)

/README.TXT: Full database import: removed `up` on jupiter because this is done as part of "do steps under Maintenance > "to synchronize vegbiendev, ..."

/README.TXT: Full database import: moved "do steps under Maintenance > "to synchronize vegbiendev, ..." outside of "On local machine" because these steps don't only take place on the local machine

/README.TXT: use `up` instead of `svn up --force` for consistency

fix: /README.TXT: always use `up` instead of `svn up` since this includes --force

/README.TXT: Full database import: removed unneeded `ssh -t vegbiendev.nceas.ucsb.edu exec sudo su - aaronmk` at beginning since this is performed again the first time it's needed

fix: /README.TXT: Full database import: removed erroneous line that resulted from a search-and-replace of connection commands in r12396. (it used to read "Follow the steps under Connecting to vegbiendev above, using jupiter instead". this step is now performed on the line below it.)