[kde-guidelines] Styleguide: Check boxes

[Heiko Tietze]

- Substructure adopted, and some items moved

Old: "For more than five options, use either a list with multiple selection 
enabled or the dual-list pattern."
New: "For more than five options, use either a 
[[Projects/Usability/HIG/ListView| list view]] or the 
[[Projects/Usability/HIG/SOU_Workspace/Two_Lists | dual-list pattern]] in case 
of multiple selections."

Reviewing the content I noticed that some items would fit to radio buttons as 
well, especially from the appearance section. E.g. "Do not add line breaks.", 
"Do not separate check box and label.", "Label every check box.", "Do not use 
ending punctuation". And vice versa "Use title style capitalization for the 
radio button options." 

Shouldn't we duplicate these information?