The splash screen can be configured, in a rather limited way.
Minimum number of seconds to display splash screen for.
The splash screen may be displayed for a wee while longer than
this, depending on how long it takes the machine to initialise
Proof General.
Evaluated to configure splash screen displayed when entering Proof General.
A list of the screen contents. If an element is a string or an image
specifier, it is displayed centred on the window on its own line.
If it is nil, a new line is inserted.