Line width of latexdiff -h help page too long

[fkbreitl]

The line width of the latexdiff help page exceeds the standard characters length a linux terminal and adds a lot of line space because of line breaks. It would be nice if it would conform with the standard, since many people like to put consoles next to each other and therefore cannot handle oversized lines well. For the standard see here: https://stackoverflow.com/questions/6862968/is-there-a-norm-or-standard-width-for-gnu-linux-unix-terminals http://rdingwall.com/2008/05/31/is-the-80-character-line-limit-still-relevant/

latexdiff-vc -h looks ok already.