ccdpack: Add bash-specific code to initialisation file

There were csh-specific items that had not been migrated to
the bash version. These were:

 - CCDPACK shell scripts such as ccdexercise
 - Format conversion environment variable setting
polpack: Add POLPACK bash-specific code to match csh code

The IFD file had no code for bash that set the format conversion
environment variables. These have now been ported to bash.
ccdpack: The ard file name changed years ago so update ICL test script