v1.5.2!

I apologize - I ended up working on this release a lot longer than expected. Life took some turns. I didn't have the steady week-to-week cadence I usually do.

So here's the biggest stuff in 1.5.2. Full info in version_info.txt, as always. There was a lot this time:

- Climbing is no longer still dangerous at 100 skill

- Hirelings and adventurers can have procedurally generated descriptions

- Random artifacts (randarts)

- Implementation of the "X Lore" skills (with Oceanography renamed Ocean Lore). These allow you to find hidden treasure and shipwrecks, which have a nice cache of items and can have randarts.

- If you can fly, you can move up to open sky

- If you can swim, in certain places you can go explore underwater (careful if you have limited air, though!)

- Carcassia has been extended a bit, upwards. Try exploring once you have a way of flying.

- There is now a skill trainer located by the fighting pits in Carcassia, if you want a way to spend your ivory...

- Hills can have dolmens, a remnant of a long-vanished people

- Forests at the northern and southern extremes of the world are rockier and have more and more evergreens

- Lots of bug fixes