Issue #2355

Closes #2348

(It wasn't working in the first place.)

Issue #2390

Issue #2380

Issue #1474 was the cause of this hack
Issue #2384 was apparently caused by it

Recent Webkit-ish browsers seem to no longer have the problem that
it was working around.

It has been superceded by keymap/sublime.js.

Issue #2354

"Shift-Ctrl-K"            Delete line
"Ctrl-K Ctrl-K"           Delete line to right
"Ctrl-K Ctrl-Backspace"   Delete line to left
Swapline                  scrolls with the cursor

Issue #2354

Issue #2371

Issue #2362

Also add origins to the changes generated.

This makes it easier to update selections by mapping over them.

Issue #2368

Issue #2369

Issue #2305

Issue #2360

Conflicts:
	lib/codemirror.js