SD2-608: Cannot remove breakpoints via breakpoint pad;
SD2-609: Cannot go to source code line from breakpoint pad;
SD2-610: Saved breakpoints should be displayed in breakpoint pad on opening a solution
git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@1064 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61