Ignore trailing spaces and improve delimiter

[Frank Fischer]

1. At the moment, having "Name" and "Name " (the latter with trailing whitespace) in two lines yield two different nodes. This has been reported as confusing by some, so could we ignore trailing spaces (and only them) when extracting node labels?
2. For the delimiter, we need a hashtag followed by a whitespace at the moment. Wouldn't it be enough to have just the hashtag without the whitespace? This would shorten the explanation how to delimit co-occurrences.