[Release] Petal 2.06

Hi List,

Here is a release with a few bug-fixes and minor improvements:

- An HTML-friendly error mode:

If you set $Petal::HTML_ERRORS = 1, Petal will display the errors in the 
HTML rather than die(). It is mainly useful if you intend to give remote 
access to the templates of your application to people who do not have 
access to the machine or its logs.

- Entity encoding is fixed on overloaded objects. (That's the bug which 
Bruno filed)

- Metal use-macro now does not include document declarations at the top 
of included templates, as it should.

Enjoy!

Cheers,
Jean-Michel.