Tweak a bunch of Emacs settings

* Use Custom to set whitespace style.

As much as I dislike using Custom for lists where I just want to
add/remove a couple of elements, the previous method introduced a
subtle bug where visiting a diff buffer, *then* activating
whitespace-mode resulted in diff-mode's whitespace style applying
instead of mine.  Something to do with diff-setup-whitespace I guess.

* Make Org comply with RET/C-j conventions in the rest of Emacs.

Since Emacs 24.4, by virtue of electric-indent-mode being enabled by
default, RET is the "smart newline" key which handles indentation, and
C-j is the "dumb newline" key which simply inputs character 0x0A.

* Stop popping another frame for Ediff's control buffer.

The popup frame needs its own .Xresources entry. Sometimes it
disappears behind the system tray.  Having another window allows
other-windowing.

* Make line-number-mode try harder with long lines.

* Change the scroll logic.

scroll-conservatively > 100 tells Emacs to *never ever* recenter
point, which is annoying when jumping to e.g. a search result or a
tags definition.

scroll-conservatively = n < 100 tells Emacs to recenter when scrolling
needs to move more than n lines, and to scroll only m lines when m≤n.

* And some other stuff.

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