Incrementally committing changes made over the duration of my time working on ED.
Differences:
   Makefile: Changed cs6 makefile in bin, 2nd arg modifies filename
   dependency.mk: Added ddependencies for iso_alloc.f90 and isotopes.f90
   install.sh: In cs6 bin, now reflects opt level E
   isotopes.f90: This file contains memory for isotope accounting.
   iso_alloc.f90: This file holds various routines for isotope accounting.
All kinds of changes...
Moved update of yearly variables (actually, this was in last commit, but I got rid of the
commented out old call) and removed part of a dtlsm hack I had erroneously in last commit.