Rewrites abstract

Please @fergunet and @deantares check it out for inconsistencies and errors.
Changed the introduction

But the motivation for the termination conditions tested and which ones we are using are missing; also how are we going to compare and using what metric those termination conditions. I'll take a look at the rest of the paper but @deantares and @fergunet should *really* look into this now to finally close if possible issue #1 (which is the first)