rnd-20060518-1-src

rnd-20060518-1-src
* changed gravity (which only affects the player) from level property
  to player property (only makes a difference in multi-player levels)
* added change events "change when CE value/score changes"
* added change events "change when CE value/score changes of <element>"
* added new "INFO" chunk to level file format for global level settings
* added all element settings from "HEAD" chunk to "CONF" chunk
* added all global level settings from "HEAD" chunk to "INFO" chunk