Added error message when mods fail to load.
Refactoring save code to support ironman mode.
Fixed some strings.
Palette bug
alter alien mission scoring a little.

makes it a little bit more modder friendly by awarding points based
on mission rules, rather than hardcoded types.
(aliens score mission points when the UFO lifts off)

and add a default for trajectories that WON'T crash you game.
Merge branch 'master' of https://github.com/SupSuper/OpenXcom into statStrings