Added Stand-Alone Registrations and various other features and fixes

Added Stand-Alone Registrations and various other features and fixes

Added sort order for registration classes (levels) - Drag and Drop
Added ability to create a Stand-Alone registrations event (Not tied to event in Events Add-On).
Added ability to hide registration events from front-end lists.
Added ability to select a registrations event by code.
Added ability to specify a registrations event on URL using registration event code rather than ID.
Added ability to go direct to a registrations event front-end page from admin registrations event dashboard.
Added more terms and phrases and updated defaults for those that didn't have them.
Added notification on registrations event dashboard for why a registrations event won't show up on front-end.
More intelligent selection of month initially displayed for calendar in dashboard for a specific event.
Displaying above calendar why the initial month displayed was selected. Hide after month change.
Added reg_bill_info_requested field to management for selection of checkout fields.
Defaulted reg_bill_info_requested field to all on to show all checkout fields by default.
Commented out management selection of checkout fields by payment type temporarily.
New Rate edit form now has default values.
Fixed a range of error log notices regarding undefined variables in models and views.
Removed "data" directory with code to inject original test data.
Fixed non-working "Read More" button on registration page.
Fixed incorrect "Total Charge" at bottom of checkout page when discount codes are applied.
Fixed bad dialog box layout due to CSS from Bootstrap
Fixed incorrect use of href in form tag