the
  output command order)
- remove the use of pdftoppm. So now only convert and pdfinfo are used, so now
  xpdf
  installation is not required to use erp5_pdf_editor bt
- add verbose parameter on convert command. This permit to get background real
  size using a unique command.
- regular expressions are now used to parse command output, this is more
  efficient than all split() and easyer to maintain
- add a comment on getPageattribute method
- simplification of getPageattribute method : remove the use of pdftoppm, just
  return one width and one height because there is no sens to return all page
  width and height when convert will set all pages to the same size.
- rename getPageattribute method to respect naming convention



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@20309 20353a03-c40f-0410-a6d1-a30d3c3de9de