perfs + new database access

perfs + new database access

 * improve perfs wrt html escaping :
    1. I do NOT understand php refs at all : call by ref seems to be slower than call by value !?
    2. Based on (1), escape_html do not pass args by refs, but by value.
       -> 25% of pure speed gain on mescontacts.php

 * create {iterate ...} compiler function :
    - works like {foreach} but you give a XOrgIterator for 'from'
    - very very very nice for database lazy copying (we don't need mysql_assign anymore).
    - mescontacts.php as a proof of concept.

 * database access class :
    - SQL abstractors sux, they are too complex
    - drupal has nice things, I've inspired myself. The desired things are :
        . drop magic_quotes_gpc
        . maybe have one day some features wrt table names (some ACLs ?)
        -> for that, our tiny engine is enough.
        -> if it's sexy enough, I plan to make it enter diogenes.
    - create SQL Iterators.  nice, clears the mysql_datas.
        -> make them lazy would be great though (memory ...)

git-archimport-id: opensource@polytechnique.org--2005/platal--mainline--0.9--patch-154