not user friendly

this fix serach issue when page has listbox

1. add brand
2. facebook like button, twitter share
3. display correct currency symbole
4. product is always available: user can purchase then we order from customer
5. change cache policy

and not safe to install erp5_immobilisation on nexedi erp5

    **** Warning: considering '0000000000 XXXXX n' as a free entry.

https://codeyarns.com/2014/03/10/free-entry-warning-with-ghostscript-and-imagemagick/

> This warning turns out to be from the Ghostscript program, which is used by
> ImageMagick internally to perform this format conversion. This page explains
> that this error has been fixed in a recent version of Ghostscript. I used a
> newer version of Ubuntu, that is 13.11, that had a newer version of gs and I
> was able to perform the format conversion. It still gave off the warning,
> but the conversion was done.

Image.py tells imagemagick to convert to stdout.
Warnings are also returned via stdout before actual rendering.

convert: not authorized `/tmp/magick-21492bHsMuWjOhmCg' @ error/constitute.c/ReadImage/416.
convert: no images defined `png:-' @ error/convert.c/ConvertImageCommand/3253.