v0.4.0

• Better Navigation: automatic zoom-to-fit and better double-click detection.
• Genome Tweaks: longer, fixed-length genome and more flexible body plans.
• Fix "A Chromosome Is Forever" Bug: reproduction could add genes, but never remove them.
• Fix "Don't Bother Saving" Bug: experiments were not auto-saved reliably every ten minutes.
• More tweaks and fixes.