Functions object

Functions linked to the schedule can be allocated at the level of the switching points, and executed this way.

`Copy`	Copies the selected functions to the clipboard.
`Cut`	The selected functions are copied to the clipboard and are marked for deletion. The functions are only deleted once they have effectively been inserted (i.e. pasted) into another schedule. Switching points using these functions will be deleted.
`Replace function`	Allows users to replace a selected function with another function. All switching points using the source function are modified in order to match the target function. If the target function is already linked to the schedule, the source function's allocation is deleted.
`Delete function`	Deletes the function's allocation link to the schedule. Switching points using this function will be deleted.
`Permissions`	Opens the Permissions dialog.
`Help`	Activates online help.