- suplement command line options with configuration file
  (mainly because snmpd(8) does not support passing options)

- implement more probes [thl]

- support MIB SEQUENCEs [rse]

- split out MIB parts of each probe into own sub-MIBs

- Makefile and snmpdx.sh still contains some hard-coded things

- provide top-level MIB prefix name as variable