new saxs rt to cover the case of gaps in sequence #2915

Job	Run time
conda / conda (ubuntu-20.04)	10m 13s
docker / docker (fedora39)	21m 30s
conda / conda (macos-12)	21m 21s
docker / docker (rocky8)	23m 17s
conda / conda (macos-14)	8m 7s
codecheck / codecheck	39m 40s
linux / linux (-doc-mpi-)	39m 17s
mac / macports (macos-12)	16m 49s
linux / linux (-mpi-)	51m 3s
mac / macsimple (macos-12)	9m 4s
mac / macports (macos-14)	10m 42s
linux / linux (-coverage-mpi-)	1h 1m 2s
mac / macsimple (macos-14)	5m 19s
mac / macports (+allmodules, macos-12)	24m 34s
linux / linux (-debug-)	30m 39s
linux / linux (-debug-mpi-)	38m 56s
linux / linux (-intel-)	45m 23s
linux / linux (-pycv-mpi-)	16m 57s
	7h 53m 53s

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