Updating version number and removing need for pdfcrop

Specifying a more appropriate paper size

PDF making ~working

Various fixes and adding the user-preamble insert

Added tag pyslha-0.5.1 for changeset 9a0c2171bd69

Also natively plot from ISAWIG files: 0.5.1 pyslha-0.5.1

Now that we have TikZ, I think it's time for a version increment to 0.5.0

TikZ mode version 1 done! That was easy...

Adding decay arrows in TikZ

TikZ plotting underway. x-coord overhaul required.

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