fixes #47

[amishas157]

Behavior of tile boundary:

• By default: It is set to off.
• Tile Boundary will be displayed when zoom >= 10 and Tile Boundary button on button left is set to ON.
• The tiles are divided for zoom level =12.
• The label reads as : x,y

cc: @planemad @geohacker @ajithranka

[planemad]

Works great @amishas157 . Come changes:

• Its not clear to a user the tile boundaries only show after zoom level 10. A simple fix is to indicate this in the toggle button: Tile boundaries (z10+)
• The label for each boundary is X,Y,Z. Since Z is always 12, its not really useful information. Just X,Y will do and will reduce the clutter.

[geohacker]

Nice work @amishas157. 🙇 ty for taking care of this.