Fix --tabs=0 in side-by-side mode
#751
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Search for tabs in the input, keeping track of how wide the text before it is, so that we can compute the width of the tab as the number of cells necessary to get to the next tabstop, letting us start the plus side at a consistent column.
Tabstops are hard-coded at 8 because getting the information from the terminal is non-trivial, and it should be extremely rare that it would be set to anything else.
Fixes #750.