imagery: osstvw_make_diffs only trim files <180KB
imagery: osstvw_make_diffs only trim files <180KB

tomhughes/openstreetmap-chef,gravitystorm/chef,Firefishy/chef,Firefishy/chef,gravitystorm/chef,tomhughes/openstreetmap-chef,gravitystorm/chef,tomhughes/openstreetmap-chef,zerebubuth/openstreetmap-chef,gravitystorm/chef,zerebubuth/openstreetmap-chef,zerebubuth/openstreetmap-chef,gravitystorm/chef,tomhughes/openstreetmap-chef,Firefishy/chef,openstreetmap/chef,openstreetmap/chef,tomhughes/openstreetmap-chef,zerebubuth/openstreetmap-chef,Firefishy/chef,tomhughes/openstreetmap-chef,zerebubuth/openstreetmap-chef,openstreetmap/chef,tomhughes/openstreetmap-chef,zerebubuth/openstreetmap-chef,openstreetmap/chef,openstreetmap/chef,gravitystorm/chef,Firefishy/chef,tomhughes/openstreetmap-chef,zerebubuth/openstreetmap-chef,openstreetmap/chef,gravitystorm/chef,openstreetmap/chef,Firefishy/chef,gravitystorm/chef,zerebubuth/openstreetmap-chef,Firefishy/chef,Firefishy/chef,openstreetmap/chef