Make nxagent-specific keyboard bindings configurable (320_nxagent_configurable-keystrokes.full.patch).

  Replaces the hardcoded nxagent keybindings by a configurable
  table of keybindings. The default configuration is the same as the
  original one, to maintain compatibility. A user/administrator can either
  specify a command line parameter, environment variable or place a file
  in ~/.nx/config/keystrokes.cfg or /etc/nxagent/keystrokes.cfg to reconfigure
  these keybindings.

  The configuration file format is XML, a dependency on libxml2 is added
  to allow parsing the configuration.