Deprecate proc 'apm_db_type_keys' as the info it provides is already in 'ad_known_database_types' without need for queriesTODO: find out if we really need a table of database types
Improve indentation, use non indentation-breaking idioms to create report stringTODO: refactor this bug-tracker dependency outside the core, e.g. using a callback
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).
