feat: merge consecutive utterances and add next/prev tags #68

Job	Run time
decade-1900 (3.8)	14m 8s
decade-1860 (3.8)	7m 39s
decade-1890 (3.8)	10m 59s
decade-1940 (3.8)	9m 22s
decade-1960 (3.8)	32m 37s
decade-1980 (3.8)	35m 0s
decade-1880 (3.8)	10m 18s
decade-1870 (3.8)	8m 5s
decade-1910 (3.8)	7m 20s
decade-1970 (3.8)	15m 11s
decade-1920 (3.8)	7m 37s
decade-1950 (3.8)	7m 14s
decade-1930 (3.8)	7m 59s
summarize-decadewize-reults (3.8)	1h 24m 32s
	4h 18m 1s

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