fixed bug on download or time series data
read grid in source_base/_resample_spatial instead of
resampling/resample_to_shape
removed bug in image reader
updated setup file
removed notification if file already exists
removed "file exists" notifications
delete files in TMP folder
resampling of second key takes only unmasked gridpoints (faster)
#26: new point-in-polygon test
#29: check if TMP folder is empty
Merge remote-tracking branch 'upstream/develop' into develop