V1.6.1.16: refactor: use vectors for LengthHydro and BasinAreas instead of matrices

Refs #34
3 jobs for sd in 11 minutes and 53 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #97821
build_patched

00:00:39

 
  Tests
passed #97823
check_as_cran_patched

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passed #97822
check_not_cran_patched

00:09:23