Handling of unclean facets

[teckart]

Request: Some elements that vary only in some aspects (linebreaks instead of space etc.) should be "unified" (for example s/\s{2,}/ /g)

[knappen]

The example pattern does not match a line break or a tab without attached spaces, better is
s/\s+/ /g (or in the pattern idiom above s/\s{1,}/ /g ).

[knappen]

Is a line break matched by \s? If not, do s/\n/ /g first before removing superflous spaces and tabs.

[Twan Goosen]

-> #688