Improvements in scalebar and scaleDenom mapgraphics

[nprigour]

Improvements include:

1. scalebar mapgraphic always starts from a value 0 (for bar types <>BarType.SIMPLE)
2. scaleDenom (map scale) mapgrahic style configurator improved by adding the ability to display a cutome label in front of the map scale (see also attached screenshot)
   

Signed-off-by: Nikolaos Pringouris nprigour@gmail.com

[fgdrf]

@nprigour Thanks for this pull request!
I'm not sure about encoding and save/restore behavior after restart. Which encoding is used to store the label text in the Memento? Is it worth to test with different encodings here?

@egouge What do you think from another user perspective? IMHO its worth to merge it into codebase and uses can Just name the scale in their language.

[egouge]

As long as this is optional & special characters from other languages work I think this is fine.

[fgdrf]

It would be great if you could add a screenshot for a page listed in https://udig.github.io/docs/user/reference/Style%20Pages.html and describe the option shown in the screenshot

If you need help, let me know. Normally the the RST Markdown is straight forward to write, there is a little sphinx guide you can find here and the rst files you can finde down below docs

[fgdrf]

@egouge Thanks for your feedback! Have you tested changes on your machine? I haven't tested yet, going to test it this afternoon

[nprigour]

from some testing I performed I do not think there is any problem with the memento saving and restore.

sphinx documentation updated