Not have isis2raw compute a histogram when I select stretch=none and bittype=32bit

[lavalaz]

Description

I just want to dump the DN values from a .cub into a raw format so I can do processing that I can't get done within isis. I don't want the DN values changed in any way. So I set bittype to 32BIT and stretch=NONE. The GUI reports that the application is computing min/max for the histogram, then gathering histogram. Given the size of the files I am dealing with, these steps are very time consuming but should be unnecessary. These steps are obviously necessary if you are going to apply a stretch or change bittype (or set omin&omax), but should be possible to skip if its a raw dump of binary data. Not a big deal for small files, but can be a huge time savings for very large files.
Example

isis2raw from=some.cub to=some.raw stretch=none
results in a simple dump of binary data in the specified order (BSQ/BIL/BIP) without computing statistics on the image data.