Fix ship stuttering in main view

[mrfishie]

The ships position still stutters a bit in the main view during acceleration/deceleration, sometimes turning, and warping. This is because the Artemis client simulates movement between updates, so we need to have our values match their values for it to all look right. The default options for movement need to be fiddled a bit.

This is only a visual change (i.e it doesn't change gameplay) so not very important.

[mrfishie]

When this is fixed, revert tick speed as per #11.