Motivation behind this is to fix processing of idl files.
When LibO directory is toplevel disk directory, there are
two // in the path which could be the reason idlc fails.

- proper hinting for digital publishing by new ttfautohint of Freetype
  instead of Fontforge autoInstr

- fix LibreOffice crash with dotted tabulation (conflict between
  dot-to-ellipsis mechanisms), problem reported by user "bolond"
  on HUP.hu, and István Bobay on Libreoffice.hu

- fix proportional old style numbers leading with Euro symbol,
  problem with the first digit reported by Kim Bastin

- fix Linux Libertine G semibold Italic (missing Graphite features)

- sups uses hyphen.sups replacement for hyphen instead of minus.superior
  (use explicit minus sign or feature texm: texm keeps minus.superior
  for hyphen input, like TeX)

- new feature: "litt", optional switch for the default "tt" ligature

- fix f] and f' (typographic apostrophe) kerning in Linux Libertine
  Italic

- remove bad ligc replacement in superiors and inferiors

ReadLine differs from std::getline with respect to final lines
that end at EOF with no EOL.

i.e. see Export::ConvertLineEnds in l10ntools/source/export2.cxx
which doesn't make a massive amount of sense the way things currently are.

A DisplayScreen is a screen index as used by the upper level abstractions,
an X11Screen is a wrapper around an integer X screen index.