ICU-20297 Improve discoverability of currency formatting #390

Job	Run time
clang-valgrind-test	13m 4s
clang-valgrind-intltest (utility)	9m 30s
clang-valgrind-intltest (normalize)	9m 14s
clang-valgrind-intltest (collator)	7m 55s
clang-valgrind-intltest (regex)	6m 10s
clang-valgrind-intltest (format)	29m 24s
clang-valgrind-intltest (translit)	7m 7s
clang-valgrind-intltest (rbbi)	11m 24s
clang-valgrind-intltest (rbnf)	8m 8s
clang-valgrind-intltest (rbnfrt)	7m 21s
clang-valgrind-intltest (icuserv)	8m 27s
clang-valgrind-intltest (idna)	6m 35s
clang-valgrind-intltest (convert)	7m 51s
clang-valgrind-intltest (rbnfp)	6m 15s
clang-valgrind-intltest (csdet)	6m 49s
clang-valgrind-intltest (spoof)	5m 54s
clang-valgrind-intltest (bidi)	6m 26s
	2h 37m 34s

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