Remove unused error messages

Need to sift through the code base and remove unused error messages. I'm going on the premise that if a message is only found in these files then it should be safe to remove them:

client/errname.cc
drizzled/enum.h
drizzled/error.cc
drizzled/sql_state.cc

For now I am not removing any error numbers, just replacing them with UNUSED for example in client/errname.cc
451c451
< { "ER_SP_NO_RETSET",1415 },
---
> { "ER_UNUSED1415",1415 },

and in drizzled/enum.h
760c760
< ER_SP_NO_RETSET,
---
> ER_UNUSED1415,

So far have remove the following error messages:

ER_ABORTING_CONNECTION
ER_ALTER_INFO
ER_BAD_SLAVE
ER_BAD_SLAVE_UNTIL_COND
ER_BINLOG_CREATE_ROUTINE_NEED_SUPER
ER_BINLOG_PURGE_FATAL_ERR
ER_BINLOG_PURGE_PROHIBITED
ER_BINLOG_UNSAFE_ROUTINE
ER_CANNOT_USER
ER_CANT_CREATE_FEDERATED_TABLE
ER_CANT_DO_THIS_DURING_AN_TRANSACTION
ER_CANT_FIND_SYSTEM_REC
ER_CANT_FIND_UDF
ER_CANT_GET_WD
ER_CANT_INITIALIZE_UDF
ER_CANT_SET_WD
ER_CANT_UPDATE_USED_TABLE_IN_SF_OR_TRG
ER_CARTESIAN_JOIN_ATTEMPTED
ER_COLUMNACCESS_DENIED_ERROR
ER_CONFLICTING_DECLARATIONS
ER_CONNECT_TO_FOREIGN_DATA_SOURCE
ER_CORRUPT_HELP_DB
ER_CREATE_DB_WITH_READ_LOCK
ER_CYCLIC_REFERENCE
ER_DB_DROP_RMDIR
ER_DELAYED_CANT_CHANGE_LOCK
ER_DELAYED_INSERT_TABLE_LOCKED
ER_DIFF_GROUPS_PROC
ER_DROP_USER
ER_DUMP_NOT_IMPLEMENTED
ER_DUP_ARGUMENT
ER_ERROR_DURING_CHECKPOINT
ER_ERROR_DURING_FLUSH_LOGS
ER_ERROR_WHEN_EXECUTING_COMMAND
ER_EXEC_STMT_WITH_OPEN_CURSOR
ER_FAILED_ROUTINE_BREAK_BINLOG
ER_FLUSH_MASTER_BINLOG_CLOSED
ER_FOREIGN_DATA_SOURCE_DOESNT_EXIST
ER_FOREIGN_DATA_STRING_INVALID
ER_FOREIGN_DATA_STRING_INVALID_CANT_CREATE
ER_FORM_NOT_FOUND
ER_FPARSER_BAD_HEADER
ER_FPARSER_EOF_IN_COMMENT
ER_FPARSER_EOF_IN_UNKNOWN_PARAMETER
ER_FPARSER_ERROR_IN_PARAMETER
ER_FPARSER_TOO_BIG_FILE
ER_FSEEK_FAIL
ER_FT_MATCHING_KEY_NOT_FOUND
ER_FUNCTION_NOT_DEFINED
ER_GRANT_WRONG_HOST_OR_USER
ER_HOST_IS_BLOCKED
ER_HOST_NOT_PRIVILEGED
ER_ILLEGAL_GRANT_FOR_TABLE
ER_INDEX_REBUILD
ER_INVALID_TIME_VALUE
ER_INVALID_USE_OF_NULL
ER_IO_ERR_LOG_INDEX_READ
ER_LOGGING_PROHIBIT_CHANGING_OF
ER_LOG_IN_USE
ER_LOG_PURGE_UNKNOWN_ERR
ER_MALFORMED_DEFINER
ER_MASTER
ER_MASTER_FATAL_ERROR_READING_BINLOG
ER_MASTER_INFO
ER_MASTER_NET_READ
ER_MASTER_NET_WRITE
ER_MISSING_SKIP_SLAVE
ER_MIXING_NOT_ALLOWED
ER_NET_ERROR_ON_WRITE
ER_NET_FCNTL_ERROR
ER_NET_READ_ERROR
ER_NET_READ_ERROR_FROM_PIPE
ER_NET_READ_INTERRUPTED
ER_NET_UNCOMPRESS_ERROR
ER_NET_WRITE_INTERRUPTED
ER_NONEXISTING_GRANT
ER_NONEXISTING_TABLE_GRANT
ER_NONUPDATEABLE_COLUMN
ER_NOT_ALLOWED_COMMAND
ER_NOT_SUPPORTED_AUTH_MODE
ER_NO_BINARY_LOGGING
ER_NO_DEFAULT_FOR_VIEW_FIELD
ER_NO_FILE_MAPPING
ER_NO_GROUP_FOR_PROC
ER_NO_PERMISSION_TO_CREATE_USER
ER_NO_RAID_COMPILED
ER_NO_UNIQUE_LOGFILE
ER_ORDER_WITH_PROC
ER_PASSWD_LENGTH
ER_PASSWORD_ANONYMOUS_USER
ER_PASSWORD_NOT_ALLOWED
ER_PASSWORD_NO_MATCH
ER_PROC_AUTO_GRANT_FAIL
ER_PROC_AUTO_REVOKE_FAIL
ER_PS_MANY_PARAM
ER_PS_NO_RECURSION
ER_QUERY_ON_FOREIGN_DATA_SOURCE
ER_QUERY_ON_MASTER
ER_READY
ER_REGEXP_ERROR
ER_RELAY_LOG_FAIL
ER_RELAY_LOG_INIT
ER_RESERVED_SYNTAX
ER_REVOKE_GRANTS
ER_SERVER_IS_IN_SECURE_AUTH_MODE
ER_SLAVE_IGNORED_SSL_PARAMS
ER_SLAVE_IGNORED_TABLE
ER_SLAVE_MUST_STOP
ER_SLAVE_NOT_RUNNING
ER_SLAVE_THREAD
ER_SLAVE_WAS_NOT_RUNNING
ER_SPECIFIC_ACCESS_DENIED_ERROR
ER_SP_ALREADY_EXISTS
ER_SP_BADRETURN
ER_SP_BADSELECT
ER_SP_BADSTATEMENT
ER_SP_BAD_CURSOR_QUERY
ER_SP_BAD_CURSOR_SELECT
ER_SP_CANT_ALTER
ER_SP_CANT_SET_AUTOCOMMIT
ER_SP_CASE_NOT_FOUND
ER_SP_COND_MISMATCH
ER_SP_CURSOR_ALREADY_OPEN
ER_SP_CURSOR_MISMATCH
ER_SP_CURSOR_NOT_OPEN
ER_SP_DROP_FAILED
ER_SP_GOTO_IN_HNDLR
ER_SP_NORETURN
ER_SP_NORETURNEND
ER_SP_NO_DROP_SP
ER_SP_NO_RECURSION
ER_SP_NO_RECURSIVE_CREATE
ER_SP_STORE_FAILED
ER_SP_UNDECLARED_VAR
ER_SP_UNINIT_VAR
ER_SP_WRONG_NO_OF_ARGS
ER_SP_WRONG_NO_OF_FETCH_ARGS
ER_STACK_OVERRUN
ER_STMT_HAS_NO_OPEN_CURSOR
ER_TABLEACCESS_DENIED_ERROR
ER_TABLE_NOT_LOCKED
ER_TABLE_NOT_LOCKED_FOR_WRITE
ER_TOO_BIG_SET
ER_TOO_LONG_STRING
ER_TOO_MANY_DELAYED_THREADS
ER_TOO_MANY_USER_CONNECTIONS
ER_TRANS_CACHE_FULL
ER_TRG_ALREADY_EXISTS
ER_TRG_CANT_CHANGE_ROW
ER_TRG_DOES_NOT_EXIST
ER_TRG_NO_SUCH_ROW_IN_TRG
ER_TRG_ON_VIEW_OR_TEMP_TABLE
ER_UNION_TABLES_IN_DIFFERENT_DIR
ER_UNKNOWN_CHARACTER_SET
ER_UNKNOWN_KEY_CACHE
ER_UNKNOWN_STMT_HANDLER
ER_UNKNOWN_TARGET_BINLOG
ER_UNSUPPORTED_PS
ER_UNTIL_COND_IGNORED
ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE
ER_VIEW_CHECKSUM
ER_VIEW_DELETE_MERGE_VIEW
ER_VIEW_FRM_NO_USER
ER_VIEW_MULTIUPDATE
ER_VIEW_NONUPD_CHECK
ER_VIEW_NO_EXPLAIN
ER_VIEW_NO_INSERT_FIELD_LIST
ER_VIEW_OTHER_USER
ER_VIEW_PREVENT_UPDATE
ER_VIEW_SELECT_CLAUSE
ER_VIEW_SELECT_DERIVED
ER_VIEW_SELECT_TMPTABLE
ER_VIEW_SELECT_VARIABLE
ER_VIEW_WRONG_LIST
ER_WARN_DEPRECATED_SYNTAX
ER_WARN_HOSTNAME_WONT_WORK
ER_WARN_INVALID_TIMESTAMP
ER_WARN_QC_RESIZE
ER_WARN_USING_OTHER_HANDLER
ER_WARN_VIEW_MERGE
ER_WARN_VIEW_WITHOUT_KEY
ER_WRONG_LOCK_OF_SYSTEM_TABLE
ER_WRONG_MAGIC
ER_WRONG_OBJECT
ER_WRONG_PARAMETERS_TO_PROCEDURE
ER_WSAS_FAILED