feat: merge consecutive utterances and add next/prev tags #70

Job	Run time
decade-1940 (3.8)	7m 38s
decade-1960 (3.8)	8m 12s
decade-1880 (3.8)	7m 33s
decade-1930 (3.8)	7m 17s
decade-1890 (3.8)	8m 14s
decade-1920 (3.8)	39m 24s
decade-1870 (3.8)	8m 35s
decade-1980 (3.8)	7m 13s
decade-1900 (3.8)	8m 0s
decade-1910 (3.8)	21m 21s
decade-1970 (3.8)	15m 9s
decade-1950 (3.8)	7m 23s
decade-1860 (3.8)	7m 53s
summarize-decadewize-reults (3.8)	31m 38s
	3h 5m 30s

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