implementation of OLS 2005 example in current language

[William Cohen]

I implemented the OLS 2005 example that tracked opens, reads, and writes 
in the current systemtap language. I did the averages by hand. This 
compiled and ran with a current snapshot of systemtap.

$ stap fileops.stp
4 opens by process "udevd"
75 opens by process "init"
31 opens by process "hald"
16 opens by process "automount"
reads by process "stap": 2 Total bytes= 16384.  Average:8192.
reads by process "init": 155 Total bytes= 140360.  Average:905.
reads by process "sshd": 492 Total bytes= 8060928.  Average:16384.
reads by process "bash": 703 Total bytes= 24576.  Average:34.
writes by process "init": 141 Total bytes= 11972.  Average:84.
writes by process "sshd": 535 Total bytes= 87505.  Average:163.
writes by process "bash": 283 Total bytes= 60052.  Average:212.
writes by process "stap": 1 Total bytes= 4.  Average:4.

-Will
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