Better displaying of errors/warning

[Matias Pino]

Replace the current

#define tERR_ERROR_INT(mess) { std::ostringstream s; s << "Internal error in " << __PRETTY_FUNCTION__ << " in " << __FILE__<< ':' << __LINE__ << " : \n \t" << mess << "\nPlease send a Bug report!" << '\0'; st_PresentError( "Internal Error", s.str().c_str() );}

#define tERR_ERROR(mess) { std::ostringstream s; s << "Error in " << __PRETTY_FUNCTION__ << " in " << __FILE__<< ':' << __LINE__ << " : \n \t" << mess << '\n'; st_PresentError( "Error", s.str().c_str() ); }

#define tERR_MESSAGE(mess) { std::ostringstream s; s << "Message from " << __PRETTY_FUNCTION__ << " in " << __FILE__<< ':' << __LINE__ << " : \n \t" << mess << '\n'; st_PresentMessage( "Message", s.str().c_str() ); }

#define tERR_WARN(mess) {con << "Warning in " << __PRETTY_FUNCTION__ << " in " << __FILE__<< ':' << __LINE__ << " : \n \t" << mess << '\n';}

for something prettier. I tried to do something along https://gist.github.com/3880437 but kept finding issues (which i attribute to my poor C++ knowledge). There are a few things i wanted to do:

1. It shouldnt be displayed either on con or cerr, the message should be displayed in both places.
2. Captions are not really necessary, it ends up showing "Warning: warning in" or "Error: error in".
3. Use the DEBUG flag to show the __PRETTY_FUNCTION__/__FILE__/__LINE__ stuff or not; regular users dont really care in which line of which file the error originated.
4. Move the formatting to tError.cpp instead.
5. Add fatal error or include a "kill" flag to tERR_ERROR[_INT] as it is hardcoded to dont die (tError.cpp:60:st_PresentError()).
6. src/tools/tDirectories.cpp:1671: tERR_MESSAGE("Could not determine path to data files. Using defaults or command line arguments.\n"); <= this should be a warning instead of a message.