[Positioning] owlps-positioning is almost usable

Add Positioning creation in owlps-positioning, so the program is usable,
configuration is checked in Positioning, Input and Output, and objects
are created and run normally.

UserInterface: Minor modification, config_file_name is not initialised
in constructor anymore, it is now a default value of the configuration
entry "config-file".

owlps-positioning/src/owlps-positioning.cc

@@ -1,4 +1,6 @@
 #include "userinterface.hh"
+#include "stock.hh"
+#include "positioning.hh"
 
 
 int main(int argc, char **argv)
@@ -6,5 +8,8 @@ int main(int argc, char **argv)
   UserInterface *ui = new UserInterface(argc, argv) ;
   delete ui ; // We don't need it any more
 
+  Positioning positioning ;
+
+  Stock::clear() ;
   return 0 ;
 }

owlps-positioning/src/userinterface.cc

@@ -31,7 +31,6 @@ UserInterface::UserInterface(const int argc, char **argv)
   assert(argv) ;
   cli_argument_values = argv ;
   cli_argument_count = argc ;
-  config_file_name = DEFAULT_CONFIG_FILE_NAME ;
 
   try
     {
@@ -73,7 +72,8 @@ void UserInterface::fill_cli_options()
 {
   cli_options->add_options()
   ("help,h", "Print help")
-  ("config-file,f", po::value<string>(),
+  ("config-file,f", po::value<string>()
+   ->default_value(DEFAULT_CONFIG_FILE_NAME),
    "Alternative configuration file")
   ; // End of options
 }
@@ -122,10 +122,6 @@ void UserInterface::parse_options()
   parse_command_line() ;
   print_usage_and_exit_if_requested() ;
 
-  // Was the config file name specified on the command line?
-  if (Configuration::is_configured("config-file"))
-    config_file_name = Configuration::string_value("config-file") ;
-
   parse_file() ;
 
   po::notify(Configuration::getw_configuration()) ;
@@ -153,6 +149,7 @@ void UserInterface::print_usage_and_exit_if_requested() const
 
 void UserInterface::parse_file() const
 {
+  string config_file_name = Configuration::string_value("config-file") ;
   ifstream config_file(config_file_name.c_str()) ;
 
   if (! config_file)

owlps-positioning/src/userinterface.hh

@@ -8,7 +8,6 @@
 class UserInterface
 {
 protected:
-  std::string config_file_name ;
   int cli_argument_count ;
   char **cli_argument_values ;
   boost::program_options::options_description *cli_options ;