Math by GravityView 2.6.1

* Fixed: Fatal error if performing calculations using Gravity Forms data, using the shortcode's `filter` attribute, and GravityView is not installed
* Fixed: Filter conditions using fields with multiple input did not work

* Fixed: Incorrect formatting of calculation results with certain locales
* Added: Option to specify the number of decimal places for footer calculations

* Fixed: PHP fatal error when the plugin is used without GravityView
* Added: Footer calculations for Custom Content fields