Need to update presndep.cplhist stream to work with CMEPS output

[billsacks]

In #228 @olyson updated most cplhist stream definitions to work with CMEPS output. However, he did not change the presndep.cplhist stream, in part because this isn't fully hooked up. Once this has been added to the CMEPS output (ESCOMP/CMEPS#375), we'll need to change this block:

CDEPS/datm/cime_config/stream_definition_datm.xml

Lines 4691 to 4720 in f2c4fe1

	<stream_entry name="presndep.cplhist">
	<stream_meshfile>
	<meshfile>$ATM_DOMAIN_MESH</meshfile>
	</stream_meshfile>
	<stream_datafiles>
	<file first_year="$DATM_YR_START" last_year="$DATM_YR_END">$DATM_CPLHIST_DIR/$DATM_CPLHIST_CASE.cpl.ha2x1d.%ym.nc</file>
	</stream_datafiles>
	<stream_datavars>
	<var>a2x1d_Faxa_ndep Faxa_ndep</var>
	</stream_datavars>
	<stream_lev_dimname>null</stream_lev_dimname>
	<stream_mapalgo>
	<mapalgo>bilinear</mapalgo>
	</stream_mapalgo>
	<stream_vectors>null</stream_vectors>
	<stream_year_align>$DATM_YR_ALIGN</stream_year_align>
	<stream_year_first>$DATM_YR_START</stream_year_first>
	<stream_year_last>$DATM_YR_END</stream_year_last>
	<stream_offset>0</stream_offset>
	<stream_tintalgo>
	<tintalgo>nearest</tintalgo>
	</stream_tintalgo>
	<stream_taxmode>
	<taxmode>cycle</taxmode>
	</stream_taxmode>
	<stream_dtlimit>
	<dtlimit>3.0</dtlimit>
	</stream_dtlimit>
	<stream_readmode>single</stream_readmode>
	</stream_entry>

similarly to the changes @olyson made in #228 .

[billsacks]

Once this is done, we should remove the setting ./xmlchange DATM_PRESNDEP=none from CTSM's cime_config/testdefs/testmods_dirs/clm/cplhist/shell_commands file. (See also ESCOMP/CTSM#1844 (comment) .)