config/index.php:

config/index.php:
* Made installation on IBM DB2 more robust
* Replaced E_ALL with E_ALL | E_STRICT

includes/db/DatabaseIbm_db2.php
* Enabled DB2_CASE_LOWER option for all connections and statements
* Enabled DB2_DEFERRED_PREPARE_ON for all statements -- delays statement preparation until execution to reduce database load
* Enabled DB2_ROWCOUNT_PREFETCH_ON for all statements -- makes db2_num_rows() work correctly
* Cleaned up error handling
* Cleaned up method signatures
* Rewrote insertion to use prepared statements -- required for inserting more than 32k of text
* Insertion will never try to insert a NULL value into a primary key
* Now relying on implicit casting in DB2 9.7 -- no longer sniffing to see if column is integer or string before adding quotes
* Implemented actual prepared statement handling -- required for correct INSERT, UPDATE behaviour
* In install mode, the class will print additional messages to the install bullet scroll
* Added bitwise operations (BITNOT, BITAND, BITOR)

includes/specials/SpecialAncientpages.php
* Added skeleton DB2 syntax to the database-specific switch statement

maintenance/convertLinks.inc
* Made limit clause database-agnostic

maintenance/ibm_db2/README
* Contents replaced with link to http://www.mediawiki.org/wiki/Manual:IBM_DB2

maintenance/ibm_db2/tables.sql
* Revised types to better match the MySQL schema
* All tables names now the same as MySQL -- was using Postgres names before
* Added some additional indices
* Added the change_tag, tag_summary, valid_tag, user_properties, log_search, and l10n_cache tables
* Added several new columns

maintenance/storage/compressOld.inc
* Made limit clause database-agnostic