neighbour cells

[jolly]

hi,

i improved the generation of neighbour cells of openbsc. the patch is
committed at origin/jolly/rtpmux.

it generated the system information messages of neighbour cells in the
same and in other bands. depending on the location of the bcch and the
neighbour cells, the messages SI 2/5 and optionally SI 2bis/5bis and SI
2ter/5ter are generated.

i have tested it with several configurations. i would like to commit it
to master. any suggestions?

regards,

andreas