Multi-view edit III.
 * Save left view in two=view mode with "removed" lines
 * ask what file to save if more are set as editable
 * don't mark view changed if is only source of change
 * change "moved form" line to "added" on copy

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk/src/TortoiseMerge@24080 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac