EAMxx: refactor vertical remapper to handle different top/bot extrapolations #696

Job	Run time
ci (SMS_D_Ln5_P4.ne4pg2_oQU480.F2010.ghci-oci_gnu)	10m 52s
ci (SMS_D_Ln5_P4.ne4pg2_oQU480.F2010.ghci-oci_gnu)	10m 52s
ci (ERS_Ld5_P4.ne4pg2_oQU480.F2010.ghci-oci_gnu.eam-wcprod_F2010)	30s
ci (ERS_Ld5_P4.ne4pg2_oQU480.F2010.ghci-oci_gnu.eam-wcprod_F2010)	22m 18s
ci (SMS_D_Ln5_P4.ne4pg2_oQU480.F2010-SCREAMv1-MPASSI.ghci-oci_gnu)	19m 21s
ci (SMS_D_Ln5_P4.ne4pg2_oQU480.F2010-SCREAMv1-MPASSI.ghci-oci_gnu)	19m 21s
ci (ERS_Ld5_P4.ne4pg2_oQU480.F2010-SCREAMv1-MPASSI.ghci-oci_gnu.eamxx-prod)	14s
ci (ERS_Ld5_P4.ne4pg2_oQU480.F2010-SCREAMv1-MPASSI.ghci-oci_gnu.eamxx-prod)	30m 3s
	1h 53m 31s

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