Revision of the index page: - pass template properties according to conventions - streamline boolean expressions - fix UI, show purge button and its explanation when the actual form is generated - make sql portable and bring it inline - better exploit api
Revert massive replacement of empty list creation sentences. The use of '[list]' instead of '{}' adds semantics that could be used for performance improvements in the future, such as using a different internal representation. There is already work in this direction, avoiding the generation of the string representation during comparison of empty strings (huge thanks to Stefan Sobernig for the pointer: https://core.tcl.tk/tcl/info/44527c632ed609c2).