BeamDyn performance improvements #3419

Job	Run time
build-all-debug-single	3m 12s
build-postlib-release	9m 19s
build-drivers-release	5m 9s
build-all-debug	4m 33s
build-test-uadriver-debug	1m 59s
rtest-modules-debug	4m 24s
rtest-module-drivers	2m 10s
build-interfaces-release	4m 1s
build-fastfarm-release	10m 17s
build-openfast-release	3m 29s
rtest-OF	6m 25s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	3m 10s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	4m 27s
rtest-OF-5MW_Land_BD_DLL_WTurb	1m 56s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	1m 2s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 25s
rtest-OF-linearization	3m 48s
rtest-interfaces	2m 58s
rtest-FF	2m 2s
	1h 15m 46s

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