Closes #2200

Issue #2283

Issue #2282

Closes #2275

Closes #2274

Closes #2272

1) Fix a bug whereby multiple '\'es in the replace part of a search and replace
string were getting collapsed into a single one.
2) Split flipEscaping into two specialized functions -- one for the regex part,
and one for the replace part.

This produces saner widths for most elements, and removes
the need for the border/fit-width hack on the pre elements.

Issue #2256

Conflicts:
	lib/codemirror.js

Issue #2255

Also configure the htmlmixed option to pass through xml-mode-specific
options to its inner xml mode.

Issue #2265

(removed non-octave ... comments, added octave's # comments)

Closes #2268

Added a wrapper for js-yaml.js to enable YAML lint support. Followed
json-lint.js pattern. Unfortunately js-yaml.js only shows one error at
a time, but something is better nothing. Checked code with linter and
ran tests. All came back clean.

(Only works if anyword-hint.js is loaded.)

Doesn't take up any space now, so that a tab of width 2 is 2 em width
rather than 3.

Closes #2262

It apparently does not have a working buttons property on its mouse
events.

Issue #2260

The vim mode was making sensible use of a searchcursor with
a match-everything regexp as cursor.

Issue #2259

It doesn't do anything useful, and makes replace-all loop
forever.

Closes #2259

Issue #2256

... so that users can use \1, \2, etc in the replace expressions.

Issue #2253

relates to https://github.com/marijnh/CodeMirror/issues/314

Closes #2075

Issue #2182

Issue #2219

add docs that when completions are object they can have a from: and to:
that will be used by pick.

Make sidebar in manual scrollable for small screen especially usefull
when `Programming API` is unfolded

seem to look nice on Chrome and Firefox Osx, (scrollbar do not appear,
except when scrolling on Chrome) but should maybe be tested on linux.

It causes autozooming on some mobile platforms.

Closes #2235

... so that '|' can be used as an OR in regular expressions or as a literal
character, depending on whether it was escaped or not.

1) fix the escaping of '(' and ')' in search expressions.
2) get the correct placement of the '\' in characters that need to introduce escaping.
3) change the capture unit test to expect that '(' and ')' should be escaped, as does real vim.