Add builtin preprocessors. Avoid creating tmp file. Fix multipreprocessor bug.

* The gf command line options -preproc=mkPresent and -preproc=mkMinimal now
  refer to internal preprocessors equivalent to lib/src/mkPresent
  and lib/src/mkMinimal.

* The temporary file _gf_preproc.tmp is not created when running an
  internal preprocessor, unless there is an error, since errors messages
  refer to locations in the preprocessed file. (Possibly allowing the rgl
  build to be parallelized.)

* After running an external preprocessor, the temporary file is deleted,
  unless there was an error.

* (Bug fix) Before, when running more than one preprocessor, the same file name
  would be used for both input and output, e.g.,

	mkPresent _gf_preproc.tmp > _gf_preproc.tmp

  which would result in an empty file being processed. Now, the input and
  output files will always be different.
  

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