Reduce logging levels
clean up
Exclude negative NODATA from becoming slice part

Sometimes negative value is used as NODATA and we select area below certain elevation.
more clean up
Support for polygons as starting point
Remove progress bar

We don't know ETA and unknown status eats up resources.
Show seconds elapsed instead.
GUI cleanup

* Disable Abort button by default
* Enable editing for POI
Fixup plural to singular in find bottom
Attempt to terminate pool only if created
Read table names from arguments when creating bottoms
Respond on combobox selection from code
Add tooltip for find bottoms checkbox
Allow non-consecutive partition numbers

This is useful if some partitions were manually deleted
Merge branch 'poly'