replace ckanclient with ckanapi, add test for deletion of datasets #62
add columns to activity csv #64

activity-status-code, collaboration-type-code, default-aid-type-code,
default-finance-type-code, default-flow-type, default-tied-status-code,
hierarchy, last-updated-datetime
add columns to activity.csv #64

participating-org-(ref/type), sector-vocab, reporting-org-(ref/type)
add default-language column to activity.csv closes #62
alembic database upgrade for #62
add cols to activity/by_(sector|country).csv #66 #67
add OR parameter filtering #70