Added a catch to check if the user has the required write permissions on the remote directory.
Added a catch to check if the user has the required write permissions on the remote directory.

The evoker-helper.pl script has been modified to print write_error if the script can't write output.

If the write_error string is matched then evoker will now give a more useful error message.

wtsi-medical-genomics/evoker,wtsi-medical-genomics/evoker,wtsi-medical-genomics/evoker