Revert to trusted mapfish print server

_print-servlet-2.0-SNAPSHOT-IMG-MAGICK.war_ is an intermediated version patched for threads issues, while _print-servlet-2.1.0.war_ is a stock version from the maven repository (http://search.maven.org/#search%7Cga%7C1%7Cmapfish-print)


    605576d73fa2cd6f4119f360a49d5834  print-servlet-2.0-SNAPSHOT-IMG-MAGICK.war
    f22406174fbc413b7a203017f568e448  print-servlet-2.1.0.war