[Valgrind-developers] Improved nightly test script

[Nicholas N. <nj...@cs...>]

Hi,

I've rewritten the nightly test script to test both the current Valgrind 
and the one from 24 hours ago.  It's attached.

If there is no difference between the 24-hour-old results and the current 
results, it just shows the current results, same as it does now.  If there 
is a difference, it shows the diff and both sets of output.  An example of 
this is attached.

If there are no objections I'll check it in, and Tom and Julian can roll 
it out onto their test machines.

Thanks.

N