#79601: module_exist() -> module_exists()

includes/menu.inc

includes/module.inc

includes/theme.inc

modules/aggregator/aggregator.module

modules/block/block.module

modules/contact/contact.module

modules/forum/forum.module

modules/node/node.module

modules/system/system.module

modules/taxonomy/taxonomy.module

modules/tracker/tracker.module

modules/user/user.module

themes/chameleon/chameleon.theme

themes/engines/phptemplate/phptemplate.engine