add AUTOLOCAL

[TerrenceSun]

This is another way of applying ignore to outputs. We can ignore output ports by adding it to verilog-auto-output-ignore-regexp，but it takes time when there are many ports to ignore. So, mark any output port by putting AUTOLOCAL in template, with this patch that port signal would be put into /AUTOWIRE/. This operation is only meaningful for output port, as use user defined singal as input is working fine.

I find the method useful and convenient, so just pull it for further discussion.