- Move setting executable paths in Model class to Experiment.setup()
- Inspect user modules (specified in config.yaml) to changes to PATH - The modules are restricted to user module directories defined in config.yaml
- If exe is not an absolute path, search along above paths

- Refactor experiment module and model expand executable path functions
- Run module setup as part of collate
- Ignore module paths when setting executable path in model.build

- Loading user modules and modulepaths in experiment.setup to check if multiple modules are available
- In collate, only load user modules so load_modules() is run, only when mpi modules are needed
- Changed inspecting path over all modulepaths (including the ones added using `module use`) to reflect the module that will actually be loaded

- When searching paths for executable, check if file is executable

…fore/after loading modules