When CDORemap() failed due to cdo command, it only returned the error message "CDO remap failed. Possible problem: parameter 'grid'.", which is not clear nor always true because the problem might not be "grid".
To print system message, the parameters of system() ignore.stdout and ignore.stderr should be set as FALSE. But due to the repetitive redundant messages (see issue #64 (closed)), we want to ignore them most of the time. The middle solution is to add one parameter to print the messages when necessary.