Remove useless blank space
Add declaration
Improve implementation avoiding loading extern.purs file
Add a :s command to list the modules loaded in current session.
Add a :s import and :s loaded subcommand to respectively see the loaded
modules (in current session) and the imported modules
Fix path computation bug
Remove useless code
Add a hack to be able to browse prelude's signatures.
Refactor - Remove comments + improve intermediary function name