added figure and more info about inserting North Arrows
Merge pull request #282 from diethard2/master

added figure and more info about inserting North Arrows
User manual description on the new color picker dialog
User manual description on the new color picker dialog
Merge pull request #284 from andremano/vectoroperations

User manual description on the new color picker dialog
User Manual screenshot working vector - vector properties update
Merge pull request #285 from SrNetoChan/master

User Manual screenshot working vector - vector properties update
Merge remote-tracking branch 'upstream/master'