Derivatives from back propagation and start of work on multicolvar GPUs #3594

Job	Run time
codecheck / codecheck	45m 41s
linux / linux (-doc-mpi-)	42m 4s
linux / linux (-mpi-)	50m 8s
linux / linux (-coverage-mpi-)	1h 1m 46s
mac / macports (macos-13)	14m 41s
linux / linux (-debug-)	38m 36s
mac / macports (+allmodules, macos-13)	22m 34s
linux / linux (-debug-mpi-)	51m 31s
linux / linux (-intel-)	47m 8s
linux / linux (-pycv-mpi-)	18m 29s
conda / conda (ubuntu-22.04)	12m 8s
linux / linux (-nvhpc-mpi-)	53m 16s
conda / conda (macos-13)	21m 31s
conda / conda (macos-14)	9m 31s
docker / docker (fedora39)	20m 28s
docker / docker (rocky8)	23m 55s
mac / macsimple (macos-13)	9m 27s
mac / macsimple (macos-14)	5m 21s
	9h 8m 15s

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