[avr-gcc-list] supply pins on atmega32

[Reza Naima]

I made a dumb mistake, and as a result, the supply pins on the TQFP 
atmega32 are all wrong.  I am ordering a new PCB, but until it gets 
here, I wanted to see if I could salvage the current board for some 
testing.  First off, the atmega32 has 3 VCC pins, and 4 GND pins.  Do 
they all have to be supplied for the circuit to work, or can I get by 
with just one?  I was also wondering, should the AREF and AVCC be 
attached to something? 

One other question -- can I retask the SS pin (PB4) as a general-purpose 
IO if I'm using SPI as master only?

Thanks,
Reza