BeamDyn performance improvements #3407

Job	Run time
build-all-debug	5m 9s
build-all-debug-single	3m 14s
build-drivers-release	5m 11s
build-postlib-release	9m 14s
build-test-uadriver-debug	2m 21s
rtest-modules-debug	4m 36s
rtest-module-drivers	2m 13s
build-openfast-release	3m 53s
build-interfaces-release	3m 33s
build-fastfarm-release	10m 47s
rtest-interfaces	3m 27s
rtest-OF	6m 29s
rtest-OF-5MW_Land_BD_DLL_WTurb	2m 9s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	5m 8s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	4m 29s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	57s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 41s
rtest-OF-linearization	3m 59s
rtest-FF	2m 13s
	1h 20m 43s

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