* unit.d:
  Overhauled unit system.

* main.d:
  Changed to allow the new parameter system.

* parameter.d:
  Much more flexible parameter system.

* util/array.d:
  Added IndexAll function.

* weatherfetcher.d:
  Added exception handling for std.net.curl.get.
Simplified code a little bit.
Fixed possible bug that would only cause one parameter with the same
  type to be parsed.