iafplot: renamed CI-type bootstrap -> MC ensuring backwards-compatibility

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/surveillance@819 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
no longer have to manually disable checkpolygons since spatstat now (>=1.36-0) disables it for disc() as requested

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/surveillance@820 edb9625f-4e0d-4859-8d74-9fd3b1da38cb