Icy Dwarf v13.7

Needs SDL, R, and the R package CHNOSZ to work.
Change the values of "#define release" and "#define cmdline" in
IcyDwarf.h to execute the program either from a terminal or by clicking
on the program icon in the Release folder.

Entirely functional and Valgrind-clean, aside from:
-Crack/Crack_plot.h and Graphics/Plot.h, which use SDL. This freaks
Valgrind out.
-3 minor (1 kbit total) memory leaks identified in the code.
-All the R linkage junk.

Other notes:
-Crack is a work in progress, still need to move all 4 phenomena to a
single time loop.
-Cryolava works well.
-Crack plot does not display out of range numbers in some plots, but
works OK besides that.