Revert "Valama: Show error annotations immediately (closes #66)"

This reverts commit d60c8501915404c9a1ad2878c36b5dd1f83d808a.
More descriptive label for project open and save menu items.
Handle error annotations with SourceViewer. Closes #66

 * Move annotation code from Reporter to SourceViewer.
 * Draw on Guanako update and on new file.
 * Use init method in SourceViewer to connect signals.