[daip] install.pl - more reliable memory detection for solaris

[Eric Greisen]

Thanks.  There are not so many solaris machines so things do not get
tested well anymore.  The actual memory in the machine is only one
clue to the desired AP size.  Big ones like 80 Mbyte cost a lot in
loading and swapping out and do not provide a big benefit for most
applications.

Thanks,

Eric Greisen