add synthetic datasets for test. see #3768.

habitat_risk_assessment/ecosys_risk_euc_exp.tif

habitat_risk_assessment/ecosys_risk_euc_lin.tif

habitat_risk_assessment/ecosys_risk_euc_none.tif

habitat_risk_assessment/ecosys_risk_mult_none.tif

habitat_risk_assessment/expected_file_list.txt

habitat_risk_assessment/expected_file_list_euc_exp.txt

habitat_risk_assessment/expected_file_list_euc_lin.txt

habitat_risk_assessment/expected_file_list_euc_none.txt

...t_risk_assessment/expected_file_list_hra_preprocessor.txt

habitat_risk_assessment/expected_file_list_mult_none.txt

...ssessment/synthetic_data/Input/HabitatLayers/eelgrass.dbf

...ssessment/synthetic_data/Input/HabitatLayers/eelgrass.prj

...ssessment/synthetic_data/Input/HabitatLayers/eelgrass.shp

...ssessment/synthetic_data/Input/HabitatLayers/eelgrass.shx

...sk_assessment/synthetic_data/Input/HabitatLayers/kelp.dbf

...sk_assessment/synthetic_data/Input/HabitatLayers/kelp.prj

...sk_assessment/synthetic_data/Input/HabitatLayers/kelp.shp

...sk_assessment/synthetic_data/Input/HabitatLayers/kelp.shx

...posure/kelp_ShellfishAquacultureComm_intensity_rating.dbf

...posure/kelp_ShellfishAquacultureComm_intensity_rating.prj