[Rest2web-develop] More work on validate.py

[Nicola L. <ni...@te...>]

Done three commits about validate.py .

First I committed the version you emailed me last week.

Then I moved (again ;-) ) the tests to the doctest format, and made some
refactoring and more code cleanup.

Finally I strengthened the value checks, introducing more ValidationError
subclasses, and adding many more tests, plus more refactoring and cleanup.

See the changelog for more details, only two external changes: renamed the
"date" value type to "timestamp" (no implementation yet), and the "bool"
one to "boolean". Easy to change them back, if you don't like them. :-)

I didn't yet add *all* the tests I would like to, wanted to leave some of
the fun to you too. ;-)

-- 
Nicola Larosa - ni...@te...

Learning C after learning Python can be done via Pyrex. [...]
Learning Java after learning Python can be done via Jython. [...]
Learning Perl after learning Python can ... never mind. ;-)
 -- André Roberge, May 2005