FF: fixed reading of dimension from box file name #631

Job	Run time
build-postlib-release	11m 49s
build-drivers-release	8m 32s
build-all-debug-single	3m 34s
build-all-debug	8m 40s
build-test-uadriver-debug	2m 45s
rtest-module-drivers	3m 52s
rtest-modules-debug	8m 36s
build-fastfarm-release	13m 26s
build-openfast-release	5m 42s
build-interfaces-release	5m 35s
rtest-interfaces	7m 57s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	2m 47s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	1m 5s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	11m 54s
rtest-OF	10m 51s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	2m 26s
rtest-OF-5MW_Land_BD_DLL_WTurb	3m 7s
rtest-OF-linearization	29m 11s
rtest-FF	2m 9s
	2h 23m 58s

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