Improve performance of h5trav interfaces for links to objects #156

Job	Run time
Linux Serial (Debug + Shared)	2m 53s
Linux Parallel (Debug + Shared)	3m 17s
macOS Serial (Release + Shared)	2m 22s
Linux Serial (Release + Static)	2m 58s
Windows Serial (Release + Shared)	8m 43s
	20m 13s

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