[629] Added ISO to YMD function to libtimeutils

Squashed commit of the following:

commit 8c48bc6df3ec975416662a98db422d57962f8aa0
Author: Don Shea <don.shea@nasa.gov>
Date:   Mon Nov 4 15:45:06 2024 +0000

    [629] moved some things around

commit bd521b48fdd6f7911d4bde6b8cd8a22b77ff439f
Author: Don Shea <don.shea@nasa.gov>
Date:   Thu Oct 31 16:40:26 2024 +0000

    [629] added fractions of a second to the code

commit 9d9b981d6578dca0a52a373729f41f59b11bde39
Merge: cf34e844 b92fde05
Author: Don Shea <don.shea@nasa.gov>
Date:   Thu Oct 31 15:17:39 2024 +0000

    Merge branch 'develop' into 629-iso-to-ymd

commit cf34e844
Author: chimey <tenzin.c.sonam@nasa.gov>
Date:   Thu Oct 17 00:31:47 2024 +0000

    629: Modified function signature

commit f52bce4d
Author: chimey <tenzin.c.sonam@nasa.gov>
Date:   Mon Oct 14 09:34:03 2024 +0000

    629: Changed function to void return type and added seconds to format

commit ce00510d
Author: chimey <tenzin.c.sonam@nasa.gov>
Date:   Wed Oct 2 14:43:08 2024 +0000

    629: Fixed month field

commit 24eac466
Merge: 57eb2d6e ff4561c5
Author: chimey <tenzin.c.sonam@nasa.gov>
Date:   Mon Sep 30 14:30:19 2024 +0000

    Merge branch '629-iso-to-ymd' of https://oceandata.sci.gsfc.nasa.gov/rcs/oel/oel_util into 629-iso-to-ymd

commit 57eb2d6e
Merge: 057c7fe7 ca29d052
Author: chimey <tenzin.c.sonam@nasa.gov>
Date:   Mon Sep 30 06:37:52 2024 +0000

    Merge branch '629-iso-to-ymd' of https://oceandata.sci.gsfc.nasa.gov/rcs/oel/oel_util into 629-iso-to-ymd

commit ff4561c5
Merge: 057c7fe7 ca29d052
Author: chimey <tenzin.c.sonam@nasa.gov>
Date:   Mon Sep 30 06:37:52 2024 +0000

    Merge branch '629-iso-to-ymd' of https://oceandata.sci.gsfc.nasa.gov/rcs/oel/oel_util into 629-iso-to-ymd

commit 057c7fe7
Author: chimey <tenzin.c.sonam@nasa.gov>
Date:   Mon Sep 30 06:34:25 2024 +0000

    629: Updated iso2ymd function

commit ca29d052
Author: chimey <tenzin.c.sonam@nasa.gov>
Date:   Wed Sep 25 10:08:14 2024 +0000

    629: Added ISO to YMD fn

commit aa0de2cd
Author: chimey <tenzin.c.sonam@nasa.gov>
Date:   Wed Sep 18 14:56:14 2024 +0000

    629: Added ISO to YMD function to libtimeutils