It'd probably be nice to make Wesnoth itself check it and die or at least issue a warning if sanity checking fails.* Dark_Adept.cfg and Mermaid_Initiate.cfg (already fixed)* Elder_Mage.cfg referes to halo/elder_something7.png, but the image doesn't exists(probably crimson_penguin can do a script to check issues like the two above)
There could even be a CLI option like --check-data which would make it load the #defs for every campaign and check for sanity.
David
