Make "condensed" multi-line diffs configurable

[sschuberth]

While it's nice that #402 was implemented, there are cases where we'd like to turn off that feature, e.g. to accept actual results as the new expected results. Can we maybe have a system property that toggles the "condensed" multi-line diff, turning it off by default for backwards compatibility with most past releases?

[sksamuel]

@kerooker lets add this along with the bang fix, and make that 3.2.2

[LeoColman]

@sksamuel Should we include the other non-breaking minor changes as well?

[sksamuel]

Which one was that again.

[LeoColman]

All PRs with an exception of Contracts, and commits to master that you made (I'll have to look at them to see if any implementation changed):

#506 #603 #606 #608 #609

And maybe
#543 and #613 if they're ready with this one

These are all the PRS created/merged after 3.2.1 was released