print - reference url for the config.yaml configuration
print - new design for A4 landscape - no need for PDF background

The list of changes:
* all elements are generated with config.yaml, without background PDF
  In particular: the map and overview map have a border (1pt), and
  a vertical line (1pt) is generated (with the fake null.svg image)
  for separating the principal panel and the right panel
* the principal panel includes only the title, the map (with the
  following elements: north arrow, scale bar, overview map), the
  georchestra logo and a white space for a future "free text" zone
* the right panel includes (from top to bottom) the legend, scale,
  date, sources.
* the map size is increased (from 636x368 to 652x465)
* reduced font size (from 12pt to 10pt)
print - comments in English
Merge remote-tracking branch 'origin' into mapfishapp_print
mapfishapp - use English names for print layouts
mapfishapp - add projection field
mapfishapp - add Comments (free text) field
mapfishapp - i18n for labels in the printed PDF
mapfishapp - better arrangement of Date, Scale, Proj... in printed PDF
mapfishapp - put the logo in the background PDF + English name for background PDF
mapfishapp - README stub for print configuration
mapfishapp - README update
mapfishapp - use 6pt/12pt multiples for dimensions and 10pt/20pt for fonts
mapfishapp - update README
mapfishapp - update the logo size
mapfishapp - update README
mapfishapp - Comments on the elements of the layout
mapfishapp - layout names are in English
mapfishapp - Letter template for print
mapfishapp - new A3 landscape template