Handle special casing

[tapeinosyne]

Presently, opportunities() may generate erroneous hyphenation for uppercase words that contain special-cased characters. (There is no risk of runtime panic, since all opportunities outside character boundaries are discarded.)

Two acceptable approaches would be to either discard any opportunity arising within expanded regions of the folded string, or trace it back into the original unfolded strings; in the latter case, the opportunity could be shifted to the left or right bound of the character in the unfolded string, respectively if the weight marks the first character of the expanded region or any subsequent one.

[tapeinosyne]

Fixed in version 0.7.