Fixed issue #103

 ('struct.error: unpack requires a buffer of 4 bytes' within SpatialIndexMediator in case of various parallel database accesses) by adding a database lock that blocks parallel database queries.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

Removed spechomo classifiers from gms_preprocessing/database as they are now included in external spechomo library. Removed parameter 'path_SRFs' from options file because SRFs are now provided by external pyrsr library. Removed 'RR' as possible spechomo_method. Updated HISTORY.rst and version info.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

Added new config parameters 'spechomo_n_clusters', 'spechomo_classif_alg', 'spechomo_kNN_n_neighbors' to control spectral homogenization through cluster learner prediction.
Cluster classifier are now saved with float32 data instead of float64 to save memory.

Added more Ridge Regression classifiers for different alpha values.

Updated version info (0.14.1).

Added some options to options_default.json. Bugfix database_tools.record_stats_memusage. Fixed missing lib within CI config.

Added option 'write_ENVIclassif_cloudmask' (fixes issue #72).

Added loggin to L1B_P.L1B_object.get_opt_bands4matching().

Implemented process locks to avoid CPU/RAM overload on case multiple GMS jobs are running on the same host.

Added config parameter 'max_parallel_reads_writes' to limit number of read/writes or to enable/disable IO locks, respectively.

Added L2C_P.AccuracyCube().
Added logging to DEM_Creator.

Changed default virtual sensor id to 11 (S2, 20m).

Added options 'ac_bandwise_accuracy', ''spechomo_bandwise_accuracy'.
Moved mask_clouds_confidence, ac_errors, spec_homo_errors to GMS_object.

Daniel Scheffler authored Feb 08, 2018 and Mathias Peters committed Feb 08, 2018

Added timeout to ECMWF download.
Bugfix process_controller.shutdown().
Added dependency timeout_decorator.
Commented tests out that fail due to missing ECMWF data.

Added config options 'spatial_index_server_host' and 'spatial_index_server_port'. Catched ConnectionRefusedError during connection to index server. Bugfix SpatialIndexMediatorServer.status. Added tempdir deletion to controller shutdown.

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Daniel Scheffler authored Jan 25, 2018 and Mathias Peters committed Jan 25, 2018

Moved environment checks to options.config.set_config(). Revised paths configs and removed deprecated paths settings. Added pyopenxl to dependencies.
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Added options: coreg_max_shift_allowed, coreg_window_size, ac_scale_factor_errors, path_custom_sicor_options, ac_fillnonclear_areas, ac_clear_area_labels, ac_max_ram_gb
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Added options: spatial_ref_min_overlap, spatial_ref_min_cloudcov, spatial_ref_max_cloudcov, spatial_ref_plusminus_days, spatial_ref_plusminus_years, band_wavelength_for_matching, spatial_resamp_alg, clip_to_extent, mgrs_pixel_buffer, output_data_compression.
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Renamed option conversion_type_optical to target_radunit_optical and conversion_type_thermal to target_radunit_thermal. Keys in provided JSON file are now optional. Bugfixes.
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Added function to get jsonable dict from config. Revised options schema. Moved config and options to new submodule 'options'.
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Added parser functions for options_default.json. Revised options_default.json. Added test_config.py.
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