Long variable names

[John Darrington]

I've finally committed a change implementing long variable names.

* Variable names can now be up to 64 bytes long (this doesn't
  necessarily mean 64 characters).

* System files can now be read and written in spss V12 format.

* As this makes a change to the system file format, I've bumped the
  version by one minor unit.  We're now on pspp 0.3.2

* test/expressions/randist.sh bails out on the beta and F distribution
  tests, but as per previous discussions, I think this is a problem
  with the test rather than the code.  I'll leave it to the numerical
  analysts to work out what's going on.

* Currently, the long variable names are not actually displayed in the
  output.  This should be easy to implement, but will break nearly all
  the tests, since variable names are now case sensitive for display
  purposes (but they're case insensitive in comparisons), and many of
  the tests are sloppy when it comes to case consistency.


J'


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