Changes from CLC-INTERCAL 1.-94.-2 to 1.-94.-2.1

* Added an extension module so that the calculator can register
  the configuration it needs, and a default configuration file in
  ICALC.sickrc. Updated code which needs configuration to use the
  new mechanism.

* Changed t/00use.t to use Language::INTERCAL::Distribute

* Changed intercalc to check if the INET extension is installed and only
  run the INET-specific code if it is.

Changes from CLC-INTERCAL 1.-94.-3 to 1.-94.-2

* Made a separate calculator package, so that the compiler can
  be installed without the calculator (but of course not vice
  versa).

