Log Message:
Update sqlrelay to 0.56.

Changes:
- removed VERSION from perl api bootstrap
- reorganized and simplified perl api code
- got perl api working on windows with ActivePerl
- perl api uninstall cleans up better now
- got python api working on windows with ActivePython
- consolidated php include tweaks
- got java api working on windows
- updated pdo driver to convert float fields to strings rather than ints
- updated pthread test to match rudiments pthread test
- moved everything done by children of sqlwriter interface into
  individual translations
- added plugin-based authentication framework
- reorganized code tree a bit
- reworked default values to enable more minimal configurations
- updated configuration docs and added configuration guide
- fixed cast issue with firebird 1.5
- added result set translation framework and re-implemented date
  translation using it
- fixed millisecond->nanosecond confusion in sqlr-scaler
- fixed subtle oracle instantclient version detection bug
- added null input bind support to sqlrsh
- fixed php pdo driver to return null rather than 0 for null integer
  fields and bind null rather than 0 for null integer input binds
- added attribute to return nulls as nulls or empty strings to php pdo
- added parameters for connecting to mysql via ssl
- added a few tweaks to support DB2 < 8.0
- fixed bad return value type in python getConnectionPort method
- fixed sessionhandler="thread" with listenertimeout!="0"