Add functions `guess_parse` and `guess_alphabet` (#292) #770

Job	Run time
test (1, ubuntu-latest, false)	2m 44s
test (1, macOS-latest, false)	2m 16s
test (1, windows-latest, false)	3m 45s
test (1.10, ubuntu-latest, false)	1m 40s
test (1.10, macOS-latest, false)	1m 10s
test (1.10, windows-latest, false)	2m 36s
test (nightly, ubuntu-latest, true, false)	2m 36s
	16m 47s

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