installWebEdition.sh fixes needed

[dalehenrich]

• At very beginning of script you are prompted for password ... there should be a bit of verbiage there explaining why and what will be done as root

• At end of script it looks like $WE_HOME env var is used ... probably should raise error in script if $WE_HOME not set

  [Info] Remember to set GEMSTONE environment variables by running:
  source /bin/defWebEdition
  

• doc impacts