Kernel thread is testing; Bug fixed for function get_code_end; Add a command uptime to test the timer; Add some shell scripts for quick debugging
Merge branch 'master' of ssh://git.code.sf.net/p/kestrel-kernel/code

Conflicts:
	Saturn-V/S-II/shell/command_table.c
to-utf8.sh: the usage of command iconv changed for better compatibility