Deallocate all the assigned memory in one go when MODFLOW finalizes (… #518

Job	Run time
Check format	1m 24s
Build	9m 45s
Smoke test	10m 58s
Test Intel fortran (ubuntu-22.04)	40m 59s
Extended testing (ubuntu-22.04)	27m 3s
Test Intel fortran (macos-13)	30m 15s
Extended testing (macos-13)	43m 29s
Test GNU fortran (macos-13, false)	46m 27s
Test Intel fortran (windows-2022)	35m 39s
Extended testing (windows-2022)	1h 4m 13s
Test GNU fortran (macos-14, false)	35m 18s
Test GNU fortran (macos-14, true)	1h 4m 59s
Test GNU fortran (ubuntu-22.04, false)	44m 46s
Test GNU fortran (ubuntu-22.04, true)	1h 38m 9s
Test GNU fortran (windows-2022, false)	54m 2s
	10h 7m 26s

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