Selecting two full lines including line ends makes a selection from
line 1 to line 3 (ch: 0). This command used to sort three lines (1 to
3) which is not what I expect. This change makes it sort only two
lines if there are no selected characters on the last line.

It also fixes a fatal error if there are more than one selection on
the same line (the code used 'range' instead of 'ranges').

It also selects the trailing newline after sorting the lines so that
the whole lines are selected.

so other potential emacs-type modules can use

Closes #4419

In Replace mode (or Overwrite mode) it should still go backwards
without deleting characters.

and remove autocomplete bindings

This reverts commit 8dbb84f4.

Issue #3127

Issue #3991

The Error after the while(true) loop is not reachable and should
be removed. The "this.iterator" property should be given an
initial value of 0. This fixes two warnings reported by Closure
Compiler.

cm.save() might not exist if CodeMirror is not created from a
textarea. This adds an additional check to prevent TypeErrors.

Closes #3806

Closes #3803

zt was placing 40% of the line above the visible area, and zb was placing it too high.

Closes #3689

Closes #3684

According to http://usejsdoc.org/about-getting-started.html, jsdoc comments must start with /**

Fixes #3449

- Use 'unshift' instead of 'push' to ensure newly mapped commands come first (and hence take precedence over previously mapped commands)