Move options-network.php to the Tools menu

[nacin]

options-network.php is a misnomer, and the code admits just as much: "This option panel does not save data to the options table."

This should be a part of the Tools menu, alongside Upgrade, Import, etc. We can probably rename the file to simply network.php as well.

For the record, Jane supports this.

(In [12830]) Move network screen to the tools menu, See #12027

Whitespace and inline docs. Has a gettext/escaping fix or two as well (see also #11644)

Patch attached for whitespace and inline docs improvements. There's also a single escaping fix, using wp_htmledit_pre() for content in a <textarea>.

Second patch (cleanup)

(In [12865]) Whitespace cleanup and inline docs. Props nacin. see #12027

Nothing left in the scope of this ticket, closing out.