Changes

Fix two more cases of space to remove around em-dash

It is for this kind of reasons one shouldn't have newlines inside the source of a sentence (or paragraph)...

Replace closed em-dash by open en-dash

As long as the spaces on either side remain the space character (and not a newline), it will be trivial to change back to either closed or open em-dash.  The biggest threat is thus the line breaks inserted just to avoid long lines of source code.