Fixed a revision problem with HFI_plot.pro
Fixed a XLOG problem with HFI_plot.pro, it now accepts both XRANGE and XR as inputs, the same for XS/XST/XSTY/XSTYLE and for the Y equivalents.
Added [X/Y]LGNAT toggle to HFI_plot to use natural numbers in axis labels instead of powers of 10
Added [X/Y]TICKV compatability to HFI_plot
Merge pull request #12 from Lspencer/master

Missing keyword in LS_latexify subroutine added.