add DefaultNeXusType property #262

Job	Run time
flake8_tests	23s
python2_tests (debian10, extrasettings)	24m 18s
python2_tests (debian10, extraserver)	25m 14s
python2_tests (debian10, basicserver)	19m 38s
python2_tests (debian10, basicsettings)	18m 18s
python2_tests (debian10, basic)	20m 18s
python3_tests (debian12, extrasettings)	26m 22s
python3_tests (debian12, extraserver)	30m 47s
python3_tests (debian12, basicserver)	20m 22s
python3_tests (debian12, basicsettings)	15m 35s
python3_tests (debian12, basic)	22m 24s
python3_tests (debian11, extrasettings)	25m 39s
python3_tests (debian11, extraserver)	25m 31s
python3_tests (debian11, basicserver)	24m 0s
python3_tests (debian11, basicsettings)	15m 17s
python3_tests (debian11, basic)	19m 35s
python3_tests (debian10, extrasettings)	23m 1s
python3_tests (debian10, extraserver)	24m 56s
python3_tests (debian10, basicserver)	18m 46s
python3_tests (debian10, basicsettings)	16m 40s
python3_tests (debian10, basic)	17m 35s
python3_tests (ubuntu22.04, extrasettings)	36m 18s
python3_tests (ubuntu22.04, extraserver)	29m 42s
python3_tests (ubuntu22.04, basicserver)	26m 45s
python3_tests (ubuntu22.04, basicsettings)	16m 39s
python3_tests (ubuntu22.04, basic)	21m 21s
	9h 25m 24s

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