Michael Mayer / ctools

Filenames are now always accessed using the filename() method so that environment variables get correctly expanded.

The prefix is now accessed using the string() method instead of the generic value() method, so that string checkings can be performed.

We use the value() method instead of the filename() method to retrieve the output filename as we do not want to check whether the file exists.

…to understand for the user.

Instead of reading ahead the output parameter, I added a flag that signals when ahead reading is desired.

…for observation access