handle new islands after 10k players

[cornernote]

at the moment after 10k players, no new islands will be created

need to find a workaround for this

[cornernote]

now its 1000*1000, should be enough

[cornernote]

from OldCoder: what happens if we get more than 1,000,000 players?

[cornernote]

One solution may be to generate another start_pos file 10k nodes higher (and another cloud floor just below that).