Some Hybrid iSAM cleanup #3118

Job	Run time
ubuntu-clang-deprecated Debug	21m 12s
ubuntu-clang-deprecated Release	22m 36s
ubuntu-clang-quaternions Debug	22m 9s
ubuntu-clang-quaternions Release	22m 35s
ubuntu-clang-tbb Debug	23m 1s
ubuntu-clang-tbb Release	24m 29s
ubuntu-clang-cayleymap Debug	22m 32s
ubuntu-clang-cayleymap Release	22m 30s
ubuntu-clang-system-libs Debug	21m 29s
ubuntu-clang-system-libs Release	22m 48s
ubuntu-no-boost Debug	21m 28s
ubuntu-no-boost Release	22m 28s
ubuntu-no-unstable Debug	18m 42s
ubuntu-no-unstable Release	18m 41s
	5h 6m 40s

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