Use of hook_install sets variables unnecessarily; hook_uninstall does not remove all variables

Use of eloqua_install sets variables unnecessarily, which prevents these from being set by a Feature module when it is enabled. These variables, eloqua_site_id and batch_size, do not need to be set during install with hook_install because they are defaulted in eloqua_admin_form() via variable_set().

This is also true for the eloqua_webform_process_submit variable.

eloqua_uninstall only deletes eloqua_site_id and batch_size variables, but does not remove other variables used by the module.