OBCS_SEAICE_NEUMANN flag, more store directives, and cleanup #2906

Job	Run time
openad (global_ocean.90x40x15)	9m 13s
doc_html	1m 50s
forward (offline_exf_seaice)	4m 23s
doc_latex	3m 21s
forward (global_ocean.cs32x15)	3m 23s
openad-other (global_oce_latlon)	10m 19s
forward (tutorial_deep_convection)	2m 38s
openad-other (halfpipe_streamice)	10m 47s
forward (aim.5l_cs)	1m 48s
openad-other (hs94.1x64x5)	7m 4s
forward (isomip)	2m 38s
openad-other (isomip)	10m 57s
forward (global_ocean.90x40x15)	1m 57s
openad-other (tutorial_global_oce_biogeo)	9m 50s
forward (tutorial_plume_on_slope)	1m 36s
openad-other (tutorial_global_oce_optim)	7m 40s
forward (tutorial_advection_in_gyre)	1m 19s
openad-other (tutorial_tracer_adjsens)	9m 4s
forward (hs94.cs-32x32x5)	1m 36s
forward (tutorial_global_oce_biogeo)	1m 53s
forward (tutorial_global_oce_in_p)	1m 15s
forward (tutorial_cfc_offline)	1m 11s
	1h 45m 42s

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