#951116 by Damien Tournoud, Stevel: Fixed db_change_field() fails to convert int to varchar on PostgreSQL

#927828 by Damien Tournoud, LaurentAjdnik, boombatower: Fixed contrib can't specify custom schema types. Should fix Date module. Yay.

#761976 by Berdir, jhedstrom, tpfeiffer, Damien Tournoud, Rob van den Bogaard, andypost: Fixed DatabaseSchema_pgsql()::changeField() is broken.

#890090 by Berdir, jhedstrom, marvil07, bjaspan: Fixed Inserting into a just created table fails when trying to set a value to a serial.

- Patch #302327 by Josh Waihi, noahb, Crell, hswong3i: support cross-schema/database prefixing like we claim to.

- Patch #728338 by sun, Crell: standardize on 'field' in function names. 'It has to get worse before it can get better.'

- Patch #582948 by Damien Tournoud, agentrickard: improve safety of schema manipulation to help with upgrade path.

#718016 by andypost and Damien Tournoud: Fixed DatabaseSchema_pgsql()::renameTable() needs to rename the indexes.

#522786 by stormsweeper: Fixed Postgres numeric check needs to happen after precision check in schema generation.

#522786 by stormsweeper: Fixed PostgreSQL numeric check needs to happen after precision check in schema generation.

- Patch #360854 by sammys, Crell: added missing db_index_exists(), required to provide proper upgrade path from Drupal 6 to Drupal 7.

- Patch #370240 by Josh Waihi, stuzza, mfb, Arancaytar: PDO should quote index names in table declarations.

#373225 by Josh Waihi: Make PostgreSQL cast values when changing database columns to prevent data loss.

#349671 by Damien Tournoud and Josh Waihi: Make the PostgreSQL driver independent of schema to fix D6 => D7 update.

- Patch #342503 by Josh Waihi, Damien Tournoud et al: schema function findTables fails on PostgreSQL.

- Patch #339588 by jhedstrom, Josh Waihi, mikl: remove *_unsigned types and rework their sizes.  Fixes exception on PostgreSQL.