add hook that copies the `easybuild` subdirectory of every installation to a central `reprod` directory #127

Job	Run time
eessi_container_script (help)	1m 26s
eessi_container_script (resume)	3m 12s
eessi_container_script (container)	2m 13s
eessi_container_script (listrepos_default)	1m 58s
eessi_container_script (shell)	3m 32s
eessi_container_script (run)	2m 22s
eessi_container_script (listrepos_custom)	6m 35s
eessi_container_script (unionfs)	2m 46s
	24m 4s

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