Use word 'library' in header.
Cosmetics on the startup screen.
Return to startup screen on ESC.
Hashed options for steering force tuning; orthogonal uses.
All states now exit to main screen.
Only set velocity to min speed if it's lower than that.
Set a min speed for fleeing example.
Commentary.
A new pursuit-evasion combo demo.
Variable renaming for clarity.
Tidying.
Revise the options hash; a few of the examples employ the options hash now for demo purposes.
Some tweaks to char values in the demos.
Additional cosmetics for pursue/evade demo.
Merge branch '2.0'