rename ports util header
use universal ids instead of type-specific
upgrade drawing functions

+ for ports, move most of the duplicating code to
  generic draw_port() function
fix shape for RCS-port
fix makers and killers

+ do NURUPO-check and set pointer to module in module_mkport();
+ move body and shape killing to general kmport();
+ remove moi() functions, use chipmunk2Ds' standard ones instead
fix escapes in utils and newline in docs
add port to module at demo2()
add particles doc