Split a text into smaller pieces and make a single document of them. #685
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This is a draft because the changes were concentrated in Processor when they really should be distributed between Document and Sentence. However, it shows that the processors project does not necessarily need to be changed at all to achieve the functionality. The test cases should show the intended use. This is related to #676, but doesn't necessarily replace it. I should double check that no offset values have been missed.