Use global string constants for note keys in notes document. Use proper keys for string and text. Allow copying text for multiple notes.
Use global string constants for note keys in notes document. Use proper keys for string and text. Allow copying text for multiple notes.

git-svn-id: 765db44a9620ed55f4f8addfd3c14fe8cd57f6bb@3699 0fceea05-a30d-0410-8a8b-80ef821fb0a1

nanoant/Skim,nanoant/Skim,nanoant/Skim,nanoant/Skim,nanoant/Skim