- move all function documentation inside their respective functions

- move all function documentation inside their respective functions
- format_tc_rate: optimize formatting for whole gbit and mbit values
- get_slice: split into two functions, get_slice() and get_xid()
- support setting exempt minrate/maxrate
- support getting exempt minrate/maxrate and current byte counts
- add set() function, same as on() but just pushes to the default
  netdevice
- remove deprecated setcap() and getcap() functions; rewrote pl_mom
  bandwidth monitor to use this module, so we can now finally
  kill resman