JKupzig/regionalization_watergap3: Revised Manuscript (v1.1)

Minor modification to create plots that are 100% conform with GMD standards.

• Avoid using lat and long information in the global plot in Figure 1a
• Add unit in the y-axis label of Figure 1b ("Count" becomes "Count (-)")
• Naming of gamma is now consistent in all plots (using Greek symbol)
• Spacing in Figure C2 enhanced
• Naming of plots is now consistent with manuscript (e.g., f02.png --> Figure 2)
• The first letter of all axis labels is now always written as a capital letter
• Naming in Figure D1 changed so that "WG2" becomes now "B2B" (to be consistent with all other plots)
• The x-axis labels in Figure E1 are not cut anymore
• The y-axis label in Figure F1 is now "modified NSE (-)" instead of "NSE_1 (-)" to be consistent with the naming in the text