Change org-back-to-heading to use org's heading regex

[aditya siram <aditya.siram@gmail.com>]

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Hi all,
Org-mode uses two regex's to find headings, one from outline.el and one
defined internally and captures more information. I propose we stop using
the one from outline.el.

org-mode uses `org-back-to-heading` a lot to navigate point back to the
nearest heading.

This just delegates to `outline-back-to-heading` from the outline.el
package, which uses a regex for finding headlines: "[*\^L]+"

Org also defines another heading regex which is more capable and captures
more information: "^\\(\\*+\\)\\(?: +\\(.*?\\)\\)?[ \t]*$".

I would propose changing org-back-to-heading to use that so that a user
(like me :) ) can use `match-string` to grab the relevant parts of the
string.

Since this is a pretty simple, but sweeping change, I thought I'd bring it
up here first before patching.

Thanks!
-deech

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