OBCS_SEAICE_NEUMANN flag, more store directives, and cleanup #2903

Job	Run time
openad (global_ocean.90x40x15)	9m 10s
doc_latex	3m 45s
doc_html	2m 6s
forward (offline_exf_seaice)	4m 17s
forward (global_ocean.cs32x15)	3m 25s
openad-other (global_oce_latlon)	10m 17s
forward (tutorial_deep_convection)	2m 38s
openad-other (halfpipe_streamice)	10m 44s
forward (aim.5l_cs)	1m 37s
openad-other (hs94.1x64x5)	7m 21s
forward (isomip)	2m 44s
forward (global_ocean.90x40x15)	1m 59s
openad-other (isomip)	10m 59s
forward (tutorial_plume_on_slope)	1m 35s
openad-other (tutorial_global_oce_biogeo)	10m 16s
forward (tutorial_advection_in_gyre)	1m 18s
openad-other (tutorial_global_oce_optim)	7m 47s
forward (hs94.cs-32x32x5)	1m 35s
openad-other (tutorial_tracer_adjsens)	9m 6s
forward (tutorial_global_oce_biogeo)	1m 32s
forward (tutorial_global_oce_in_p)	1m 15s
forward (tutorial_cfc_offline)	1m 14s
	1h 46m 40s

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