Major update

DB
-new DB for registration
Data Processing
-empty columns filtering
-download limited (time) range data
File processing
-fixed downloading error after already downloaded files
-check for existing sheets
Plots
-fixed zooming feature
-second axes in graphs
-added empty secondary axes in selection
Analysis
-added selection for turbi pump
-added check for growth section (data points) length
-regression parametrers adjustment

Author: Jan Červený