* implement TLV type descriptions for NM
* add operational/administrative/availability state keeping logic to abis_nm
* explicitly print all NACK's in abis_nm
* make sure we produce [not just for BS-11] valid channel attributes
channel to another one (simple voice call switching)
* add a way more generic E1 input layer, abstracting out the misdn
low-level interface. This also adds infrastructure for multiple TRX
in one BTS, as well as multiple BTS on one E1 link
* add a E1 subchannel multiplexer for sending multiple 16kbit sub-channels
one one 64kBps E1 channel
* add TRAU IDLE frame generation
* terminate bsc_hack in case there is a E1 / mISDN init error
* introduce 'e1_config.c' file with static configuration of our
E1 setup (which TRX/BTS is configured for which TEI/SAPI/E1). This should
later become a config file rather than a compiled C file.
WARNING: all this compiles but is not tested yet. Expect fix-up committs over
the next hours or so
* new abis_nm_bs11_bsc_disconnect() function to disconnect BSC/BTS link
* add support for 'forced load' of BS-11 software to abis_nm.c and bs11_config
* remove lots of debug output
* print progress during software load
* add more BS11 specific attributes
* define all valid BS11 PA power classes
* add callback function to software load
* introduce SWL load function for BS-11 style SWL file lists
* separate activation of software from loading of software
* add function to obtain BS-11 serial number