v0.18

 [Jean-Damien Durand <jeandamiendurand@free.fr>]
 - c2ast cc replacement example
 - stack based version as per jeffreykegler
 - Tiny optimisations
 - Tiny optimisation
 - --logstderr option
 - Fix doc
 - Remove non-needed use Config
 - Promote STRING_LITERAL_UNIT as lexeme
 - Remember logInfo parameter so that we do not log more than was it
   requested
 - Fix logInfo parameter
 - Trying to fix Changes content, some dirty things will lay out forever it
   seems