Reset ammunition types when unloading a world.
Fix member name from which the faction description is read from saves.
Wide sidebar: make the message log go down to the bottom of the screen.

This occupies the previously unused space and erases / redraws it when the sidebar is redrawn.
The window w_hp goes also down to the same line as w_mesages, so it occupies and erases the space between the messages window and the terrain window.
Avoid flickering with wide sidebar:

Don't erase nor refresh the unused w_status2 window. Nothing is drawn to it anyway.
Merge branch 'faction-descriptions' of https://github.com/BevapDin/Cataclysm-DDA into merge2
Merge branch 'squash-and-terminate-the-bug' of https://github.com/BevapDin/Cataclysm-DDA into merge2