#21 change old tiobench results from .log to .txt

[Craig Thomas]

All of the result files for tiobench --
tiobench-<fstype>.log need
to be changed to tiobench-<fstype>.txt in order for
future mining
tools to compare all result data of all runs. A change
was made to
the test to write the resutls with the .txt extension
to make it viewable in certain browsers. However the
old data still has the
extension .log. These need to be changed.

For example:
change tiobench-ext2.log to tiobench-ext2.txt for all
past runs