Updated to v1.7

Vic-20 sometimes seems to have really wonky  randomization / RND. Re-did the bit for randomly generated rock-field on new maps. Hopefully now it will be more consistent with more 'thickness' to the overall rock-field (I  thought I had it working good with v1.6, but then after some more play-testing, it seemed sometimes past Map 1 it was often generating way too few rocks). We'll see how this goes. :P