[Patch] Add a reversing transaction to the one(s) currently selected

[Dawid Wrobel]

I added an option to duplicate selected transaction(s) *and* reverse it
(them). Similar functionality exists in GnuCash.

The use case is that for some of the transactions you want to easily add a
reversing transaction and assign it to an Income/Expense category. With
that in mind, the reversed transaction has the same date as the original.

Checked-in to my branch:
https://github.com/wrobelda/kmymoney/tree/add_reversing_transaction

P.S. Are you planning on moving to GitLab and using Pull Requests there to
maintain contributions like these? I am developing on mac and using
Phabricator to submit patches is quite a pain.
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