setting higher cache_size for sqlite, not writing block_sizes
using islice, closing connection each time
removed unneeded blocking_map creation in create_db.py, adding blocking_map index after inserts
ensure that blocking_key, donor_id tuples are unique
setting key,donor_id for blocking index
outputing create index time
added test script to see sqlite settings
removed unset PRAGMA variables from show_sqlite_settings
added some info to setup.py
removed write block sizes, removed sqlite_settings script, added cache_size PRAGMA back in
removed redundant SQL statement
resolved setup.py conflicts