Add exportlegends and logregion

[PeridexisErrant]

Fixed version of #231 after restarting my entire dfhack fork.

exportlegends how takes an argument to export everything (all) or just the detailed maps (maps).

log-region was giving error messages, so I've added a check that only calls the script on loading a fort, not legends or adventurer - which it couldn't handle.

[angavrilov]

Your scripts still use tabs, and moreover at the stupid setting of 4 spaces per tab. That looks awful in anything that uses the proper settings of 8 characters, like even the github file viewer.

[PeridexisErrant]

Sorry - I've only really learnt some Python and was taught that way.

I assume that replacing tabs with eight spaces would fix this? And is there a DFHack style guide somewhere that can avoid this kind of issue in the future?

[lethosor]

https://github.com/DFHack/dfhack/blob/master/Compile.rst#contributing-to-dfhack
What angavrilov means is that your editor displays tabs as four spaces, but many other tools (including Github) display them as 8, resulting in things like this.
Edit: Most DFHack scripts use 4 spaces as well (not just plugins), so I'd go with that.

[PeridexisErrant]

Right, thanks. One moment while I replace all the new eight-space indentations with four...

Edit: done.