Add DVB DiSEqC switch address selection

[anonymous]

The following patch adds addressing ability to switches under DVB DiSEqC control. This allows nesting of unlike switches (Such as a standard 4-way switch [address 0x10] attached to a DishPro LNB [address 0x11]).

There is a database update with this implementation as we need to add a "address" field to the "diseqc_tree" table to hold the individual address values for each switch. During the database update, the most common address value for switches (0x10) will be placed in any switch entries found in order to retain current user defined DiSEqC setups.

Note: There is an outstanding bug (Ticket #3529 and possibly #3255) that prevents the full effective use of this patch. The enclosed patch does not make the problem worse, but the issue is more pronounced when you have multiple DiSEqC devices attached.

[danielk]

(In [19439]) Fixes #3787. Allow multiple DiSEqC switches in a satellite setup.