Allow a view to be exported to PDF and decide columns to group by (unfinished)
Some chars now are replaced with the no-accent version (á->a, ë->e, etc)
Allow to export a view to PDF
New Excel exportation with groups and totals
Removed "html to pdf" middleware / Fixed error with totals / Added custom formats for XLS export
Fixed float format in XLS files
Merge branch 'sapns__advanced_export_to_excel' into master2
Translations
Added utf-8 encoding