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This commit sets the "Ad hoc (mesh)" wireless mode as "Ad hoc (legacy
mesh)" on the web GUI.

It also introduces a backwards-compatible mode, the "802.11s (mesh) + Ad
hoc (legacy mesh)", on the web GUI and adds code to the configuration
scripts to handle it properly.

This whole thing will ease the transition from current Ad hoc mesh
networks towards 802.11s mesh networks (e.g. Guifi.net networks in
Barcelona like Sants-Les Corts-UPC).
Signed-off-by: Roger Pueyo Centelles <roger.pueyo@guifi.net>