[Snowball-discuss] Build system, and misc changes.

[Richard Boulton]

I made a few alterations to snowball yesterday (though none which should
affect the functioning of snowball):

* correct a typo in russian/stemmer.html (algorith -> algorithm)
* moved the stemmer definitions from files named "stem" to "stem.sbl"
  I needed the files to have an extension to make the build system work
  properly.  I updated all the links in webpages which pointed to these.
* fixed a bug in snowball itself: in the generated header file: if an
  external prefix was specified, close_env wasn't being prefixed.
* made a build system, which encompasses the following, at the moment:
  - builds snowball
  - generates all the stem.[ch] files
  - generates a program "stemmer" for each language
  - uses the stemmer program to generate output.txt from voc.txt.  The
    timestamp of output.txt is only modified if the contents have
    changed.

I also began work on making the build system build a single library,
which will be able to perform stemming for any of the supported
libraries (and will be a lot more convenient for IR people such as
myself to use than including scripts individually).  As part of this
work, I changed the generated stem.[ch] files to use prefixes, to avoid
symbol conflicts when I link them together.  The prefix used is
"language_" for each language.

This means that, for example, the english stemmer now has
english_create_env() english_close_env() and english_stem().

I believe some pieces of documentation may need to be changed to reflect
this: I havn't gone through and checked for this yet.

The build system may be invoked by running "make" in the "website"
directory.

-- 
Richard

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