changed data structure of example data files to also allow n-dimensional input/output

* changed routines to read forcing/validation in utils.f90'
   - now includes SHF, LHF, and net SW
* changed 'example/example.f90'
* changed namelist 'example/example.namelist'
  - includes definition of ocean/land/ice/ocean points: loi_mask (0/1/2)
  - number of records has to be given (nx)
* plotting routine changed accordingly
* data are now not averaged but is as data (quasi-real time)