nazca #116938 Reuse the cache of `alignall_iterative()` [validation pending]

This function uses a cache. It would be nice to enable the user to reuse the cache returned by this function.

It enables the user to make a first alignment, to change the alignment settings, and do it again with the same cache to improve the results.

prioritynormal
typeenhancement
done in0.2.0
load0.100
load left0.000
closed by#f942f2393fb2 [aligner] Enable the user to reuse the cache returned by alignall_iterative() (closes #116938)
patch[aligner] Enable the user to reuse the cache returned by alignall_iterative() (closes #116938) [applied]