Threedi-modelchecker

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- Updated schema to version 208: altered table settings (v2_global_settings):
'maximum_table_step_size' was added and 'table_step_size_volume_2d'
was removed.

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- Fixed release script.

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- Added ModelSchema().upgrade_spatialite_version (and the same argument to .upgrade) to
upgrade the spatialite version from 3 to 4/5.

- Run unittests on spatialite 3 and 4.

- Improved performance of upgrading an empty database.

- Remove all NOT NULL, unique, and foreign key constraints in the spatialite.

- Fixed upgrade with backup=True on Windows.

- Added continuous integration on MacOS and Windows.

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- The simulation template worker does not add default for maximum_time_step anymore.
This wasn't necessary (the checker ensures that the setting is there when using
time step stretch) and it lead to errors if the maximum_time_step was set to a value
lower than sim_time_step when not using time step stretch.

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- Automatically (re)create views in the spatialite after performing a schema upgrade.

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- Fixed bug in timeseries checks 1201 and 1202.

- Prevent usage of GeoAlchemy 0.11 (because of a known issue).