Bugfix: Fix PCPCombine derive mode to properly set field info wrt valid time

[georgemccabe]

This came up in discussion #2752

Note that because we are close to the 6.0.0 release and there isn't an immediate need to apply this bugfix to 5.1, we will only be making this change for 6.0.0. If a bugfix for 5.1 is desired, please create a METplus discussion to request it.

Describe the Problem

In derive mode for PCPCombine wrapper, the field info is not added for each file. Instead the first field info if added at the end of the command using the -field argument. This works fine when the field info is the same for each, but the logic breaks when the valid time is used to get the correct NetCDF field from the file.

Expected Behavior

Setting OBS_PCP_COMBINE_INPUT_LEVELS ="({valid?fmt=%Y%m%d_%H%M%S},*,*)" should properly substitute the valid time for each "input accumulation" per file instead of once at the end.

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[georgemccabe]

This was completed with PR #2764 to be included in METplus v6.0.0-rc1. Additional changes were needed to properly compute the number of seconds to use for an input accum that uses inconsistent time intervals like months or years. The number of seconds is now computed from each search time so it will accurately factor in the correct number of days. This was discovered in discussion #2753. With these changes, the output accum can be set to 30Y and it will correctly build the accumulation without error.