added methods PMA_handleUpdatesForInternalRelations, PMA_getQueryForInternalRelationUpdate
added method PMA_handleUpdatesForForeignKeys
added method PMA_handleUpdateForForeignKey
errors corrected
error corrected
phpcs errors corrected
query not shown error corrected
remove global variables and use super global variables
Merge pull request #660 from scnakandala/refac_tbl_relation.php

Refactoring tbl_relation.php