Bug #900 fix - only fixed AiWonder, AiCombat, AiTravel and others may need a different strategy to this.
Bug #900 fix - minor update to comments
Fix spelling errors in comments.
Oops.  Fix typo picked up by Zini.
Feature #1030 - partial fix to stop creatures unable to walk/fly to come out of water.  Does not necessarily handle situations where they are already out of water, however.
Apparently fall trace needs to be done with the middle of the object.
Remove unnecessary comment.
Revert to original variable names.
Cleaned up more inaccurate comments.
Merge remote-tracking branch 'cc9cii/AiWander-fix'
Merge remote-tracking branch 'cc9cii/Slaughterfish-fix'