fix catch except style
add Connection.autocommit(). set and reset autocommit flag.
rename from Connection.autocomit() to Connection.set_autocommit()
fix set_autocommit() and add tests
fix set_autocommit()
fix ISOLATION_LEVEL. similar to fdb
Merge branch 'master' of github.com:nakagami/pyfirebirdsql
add DEBUG_OUTPU()
statement open after execute()
add type conversion module function
use_unicode
string too long raise warning
cleanup results when raise exception.
fetchall(), fetchmany() return []
fix test
add IntegrityError gds_codes
fix statement handle  open/close flag treatment
fix for FB3
move stmt.open()
bytes() --> bs()