[Implemented] check routine for double commands

[BackupUser]

Restored from previous forum. Originally posted by Franco.

It would be a good thing to put a little check routine in the compiler for double commands in PureBasic libraries...
Or at least show an 'Error Message' with the name of the command and the name of both libraries.

Have a nice day...
Franco

Sometimes you have to go a lonely way to accomplish genius things.