fix some error
1.console.cpp: add the exit() and fork() function;
exit() is for exit the progress
fork() is for fork the progress
2.console.h:  the define of the exit() and fork();
3.envx.cpp:   fix the error of the "cd ..";
4.parser.cpp: the notice of the not exit the dir and unknown error;
5.shl_io_api.h:add the port of the exit() and fork();