quad-band support

[Andreas.Eversberg]

hi,
 
i like to introduce support for additional bands for osmocom/layer23:
 
- GSM 850
- PCS (1900)
- GSM 480 and GSM 450
 
all bands can be enabled/disabled individually via VTY settings. by
default, only 900 and DCS (1800) are enabled. note that the bands must
be supported by the phone's tranceiver in order use them.
 
to test it in the US, change your VTY settings like this:
 
enable
configure terminal
ms 1  (or whatever your instance name is)
 support
  no p-gsm
  no e-gsm
  no r-gsm
  gsm-850
  no dcs
  pcs
end
write

of course you may enable all four bands, but this makes no sense,
because your hardware does not support all bands.

you will find the support in the jolly/quadband branch. it will be
merged, if it is fully tested. 

be sure to set "ulimit unlimited" in your shell to get a core dump in
case of a crash, so you can use gdb to locate where it happened:
"gdb ./mobile core"

everything else should work as usual.

regards,

andreas