Remove print statements
Implement XML-read in R (issue #628)
Implement XML-write in R (issue #628)

 - Breaks mtc.network for an example though
Fix example / conversion problem (issue #628)
Remove unused Java -> R conversion (issue #628)
Remove rJava, gemtc.jar dependencies (fixed #628)

 - Inconsistency models removed; dynamic loading of rJava as needed turned
   out to be impossible due to namespace conflicts in native code from rjags
   and rJava.