Rewriten the helper module.

It ended looking mostly the same, but translates everithing to english,
fixes a bug in the the units conversion function, removes unused lines
in the help function and other code cleanups.
It's now part of a package.
Recovered the configuration and database files.

This two files come from the old code, and may need a lot of fixes, but
will do for now.
The configuration file sections have been translated, but many options
remain in spanish to mark wich parts of the script are done. They will be
translated as the rewrite requires them.
Added some basic documentation