[Orgmode] TAB completion for org-insert-link C-c C-l

[Bastien]

Hi all,

I just pushed a small change I would like to hear feedback about.

The basic idea is to allow TAB completion to suggest stored links when
inserting a link with C-c C-l.  Here is the log from the git repo:

,----[ Also use TAB for completion with org-insert-link. ]
| Before this patch the completion mechanism was this: TAB let's you
| complete through link prefixes (gnus: file: bbdb: ...) then RET allows
| completion if a completion mechanism is available for the chosen prefix.
| Navigating through the history of stored links was a separate process,
| available through the up/down M-n/M-p keys.
| 
| Now TAB not only completes through link prefixes but also through stored
| links.  This behavior matches other Emacs completion mechanisms a bit
| more closely.
`----

What do you think?

-- 
 Bastien