fix initial count of table_count

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
fix compile error

make G(ks)->error visable to userspace.

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
add sample script scripts/traceio.kp

Based on systemtap traceio.stp

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
add execute mode into scripts/*.kp

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>