New branch for charset encoding issues.

[John Darrington]

I've started a new branch for fixing character set encoding issues.


So far, it reads record 7, subtype 20 to find out the ostensible
encoding of a dataset.  It stores this encoding name in the
dictionary.  The global "PSPP" encoding is no more.

Things to do before this branch is merged:

* Saving files should write record 7(20).
* More intelligent fallback if 7(20) isn't found.
* Update developers guide.
* Check what happens when mergeing (eg with MATCH, ADD, UPDATE)
  datafiles with different encodings.
* Should add some manual override.

Anyway it opens and correctly displays Korean, Japanese and Slovenian
files now. 

Comments welcome.

J'

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