Small test fixes for PostgreSQL

Based on whether we are on 32 or 64 bit platform, postgres will return a string or an int for the expected php type of a bigint that is > 32 bits.

Use dropAndCreateDatabase schema manager function in test initialization instead of individual versions of each.

Fix DDC-1978

ExpressionBuilder in and notIn methods

Changed 'implements' by 'extends' on SQLAzureFederationsSynchronizer

Changed 'implements' by 'extends' because AbstractSchemaSynchronizer is a class not an interface (and Eclipse PDT shows a warning that say that "The type SQLAzureFederationsSynchronizer must implement the inherited method processSqlSafely, processSql" but those methods are already implemented on AbstractSchemaSynchronizer).

Fixed some phpdoc

Added a missing method in the Constraint interface

Fix unsigned columns in MySql

Unsigned column properties were never set. In consequence all migrations diff were trying to change the column definition when it was already changed.

Fixed a typo in a method name

improved exception messages when driver error occurs

Fixes error with ORA-03131 in oracle stored procedures

Used the placeholder in the command help for the name

Fixing breaking test provoke by #172

Fixed typos