1. Pass long description type as a typed enumeration (normal inspection, market, event, or surgery).
2. Remove surgeryDescription global and the eventDescription long description flag as they're both obsolete.
3. Don't pass detailed market information on from the main description (it still needs it, but nothing else does).  That means we can just pass DescType instead of a big partial-optional object.
4. Simplify slaveDescriptionDialog and remove the SugarCube version (which is no longer used).