[O] Adjust org-contacts-wl functions to used standards

[Michael Markert]

Hi,

Following the merge of org-contacts-wl with org-contacts I thought it
would be nice to unify the interfaces.

The patches follow separately.

Open Problems:

* Make both accessible through `org-contacts-template-name', I see two (a half) 
possibilities
  1. Use a variable to specify a "name-email" function
  2. pass a variable to `org-contacts-template-name' to choose per call
  3. half: Use 2. but define functions (per backend) that call with the
     appropriate variable


Michael

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