Something tcharge perhaps should be able to do (lists is getting longer...)
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* Should -user accept an argument <username> ??

* New Option "-pidfile <pidfile>" ?

* A Script to find out where are the Xlibs, perl, ...

* should separate X-stuff from charge-calculation into modules in
  order to use the calculus for plug-ins, e.g. perl or java (to use
  tcharge calculation routines via SWIG...)

* make the option names shorter or define aliases for them
  (GNU-style)??

* Add explicite support for SLIP and PPP that is add one option for
  each instead of using e.g. '-watch-file /var/run/ppp0.pid'

* When offline: Make the clockface shaded (requested??)

* tcharge could work as a 'button' for connect and disconnect.

* when watching a pidfile: get time of getting online from /proc/PID
  directory instead from the creation time of the pidfile??

* improve ISDN support: get connect time in a better way

* would be better to have an explicite type-check for the
  charge-file-variables in `mktc' (int, float, string).

