-Hacky fix to string editing issues.
-Removed debug call.
Merge pull request #592 from mmcguinn/hassan

Hassan
-Fixed preprocessor to deal with nulls.
-Fixed formatter to not show NaNs in table.
-(hack) removed all blackslashes from strings.
Merge pull request #593 from mmcguinn/hassan

Quick fixes
-Added a lock zoom checkbox to the scatter/timeline controls.
-Fixed issue where data reduction would attempt to clip an array of size zero. Fixes #594.
-Increased the height of featured items. Fixes #595.