To have this ferret tools directory available in all ferret scripts, add
the following line to ~/.tcshrc (after installing ferret via soft.init):

if ( ${?FER_GO} ) then
  setenv FER_GO "$FER_GO /MYPATH/tools"
else
  setenv FER_GO "/MYPATH/tools"
endif

Alternatively, you can create a link to this directory and include the
tools directory in $FER_GO:

cd <my-ferret-files-dir>
ln -s $HOME/ferret/tools .
setenv FER_GO "$FER_GO ./tools"
