Changes to: models/petsc3.4/inertgasgasex
  - fixed serious bug in inert_gas_fluxes.F to do with computation of Finj flux.
  - external_forcing_inert_gas.c now reads a binary file containing the surface layer
    thickness (instead of the command line option -dzsurf).
  - cleaned up runscripts/ and matlab/
  - added Makefile specific to this model in src/
Changes to be committed:
	deleted:    models/petsc3.4/inertgasgasex/matlab/basepath.mat
	deleted:    models/petsc3.4/inertgasgasex/matlab/do_spinup_mfnk_broyden.m
	modified:   models/petsc3.4/inertgasgasex/matlab/make_input_files_for_inert_gas_with_gasex_model.m
	deleted:    models/petsc3.4/inertgasgasex/matlab/prep_data_for_spinup.m
	deleted:    models/petsc3.4/inertgasgasex/matlab/read_timeavg.m
	deleted:    models/petsc3.4/inertgasgasex/matlab/spinup_driver.m
	deleted:    models/petsc3.4/inertgasgasex/runscripts/runpbs_directimplicitpc_darwin.signalfiles
	deleted:    models/petsc3.4/inertgasgasex/runscripts/runpbs_directimplicitpc_monk.signalfiles
	deleted:    models/petsc3.4/inertgasgasex/runscripts/runpbs_jacobian_darwin.waitscript_template
	deleted:    models/petsc3.4/inertgasgasex/runscripts/runpbs_spinup_annualmean_monk.signalfiles
	deleted:    models/petsc3.4/inertgasgasex/runscripts/runpbs_spinup_annualmeancirculation_monk.signalfiles
	deleted:    models/petsc3.4/inertgasgasex/runscripts/runpbs_spinup_annualmeancirculation_timeavg_monk
	deleted:    models/petsc3.4/inertgasgasex/runscripts/runpbs_spinup_darwin.signalfiles_template
	deleted:    models/petsc3.4/inertgasgasex/runscripts/runpbs_spinup_monk.signalfiles
	deleted:    models/petsc3.4/inertgasgasex/runscripts/runpbs_spinup_timeavg_monk
	deleted:    models/petsc3.4/inertgasgasex/runscripts/runpbs_timeavg_darwin_template
	new file:   models/petsc3.4/inertgasgasex/runscripts/runscript
	deleted:    models/petsc3.4/inertgasgasex/runscripts/starttimestepper_5profiles
	deleted:    models/petsc3.4/inertgasgasex/runscripts/starttimestepperforavg_inert_gas
	deleted:    models/petsc3.4/inertgasgasex/runscripts/starttimestepperforjacobian_annualmean_allrelax
	deleted:    models/petsc3.4/inertgasgasex/runscripts/starttimestepperforspinup_inert_gas
	deleted:    models/petsc3.4/inertgasgasex/runscripts/waitfornewic
	deleted:    models/petsc3.4/inertgasgasex/runscripts/waitfornewicforjacobian
	deleted:    models/petsc3.4/inertgasgasex/runscripts/waitfornewvforpc
	new file:   models/petsc3.4/inertgasgasex/src/Makefile
	modified:   models/petsc3.4/inertgasgasex/src/external_forcing_inert_gas.c
	modified:   models/petsc3.4/inertgasgasex/src/inert_gas_fluxes.F