[MERGE] sync with trunk
[IMP] fonts: adapt fonts to many2one instead of list
[IMP] better labels
[FIX] font: cleaning and better default data
[IMP] font: handle better the difference of fonts
[IMP] fonts: improvement of custom font intergration in rml reports

creation of model res.font
preload font list with basic pdf fonts for performances improvements
add 'reload fonts' on view to scan the filesystem
font selection is a simple on2many