Fix datetime strings in populated.sql test database

Fixed a set of 40 TimeSeriesResultValues insert statements in the populated.sql test SQLite database creation file, where the datetimes where only specified as dates, not datetimes; and around 2000 statements that used mm/dd/yyyy format rather than yyyy/mm/dd. They were leading to the use of a non-datetime field type. Also changed odm2api module path calls in test_odm2/test_readservice.py to remove deprecated use of ODM2 module hierarchy.
Fixed other test TimeSeriesResultValues datetime entries

Author: emiliom