tornelib-php-database

Pull request #7: PHPDB-20 mysql

Merge in LIB/tornelib-php-database from PHPDB-20-mysql to master

* commit 'e0b72450ac047d17747006c5b760a07424785cda': (22 commits)
  Connectivity is done!
  deprecated driver can not be tested on PHP 7 or higher
  readme
  MODULE_DATABASE.php support connection and adaptive drivers.
  Inspections fixes.
  Updated class with connectivity for mysqli, mysql and PDO. Simplified $currentIdentifier
  mysqli_connect + switch database done. Made some methods "throwable" so they can also return booleans without exceptions. Added timeouts. Flagset to make sql-driver chainable. Default userdata is set to "testusername".
  Driver class for bad driver (sql) updated. Added "preferred driver" detector. Added driver test (includes getServerList-ish test). connect() remains empty.
  Fixed docblocks and return statements and other problems. serverList in config not in use. Switch-Case transformed into ifs. Composer and readme updated.
  PHPDB-25
  Sample file updated for ipv6 testing.
  Empty file for testing configuration fetching.
  Initialize MODULE_DATABASE for compatibility.
  servertype and serveroptions
  Server type setup.
  Server password setup.
  Server username setup.
  Server port and server host.
  server port config
  Introducing a way to always pick the correct identifier from all content requests.
  ...