Patch for issue 1549. Book View incorrect for R-to-L Manuscripts. #1550
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It seems that viewingDirection was not passed to BookView so it was defaulting to L-to-R behaviour. Although 'vDirectionStatus' was used in parts.
The indexing seems to assume that the current index would begin at 0 on the right hand side, but it begun at the last index (so it would error for documents with an odd length).
Instead I have used a adjusted index for right-to-left mode to work out the odd/even case that behaves as expected (right starts from 0 in R-to-L mode).