Store raw minute trend files in subdirectories, named based on file name crc8 checksum.

IMPORTANT: please read README file for instructions how to move the existing raw 
minute trend files into the subdirectories, otherwise the access to the old minute trend data
will be lost and you will be forced to concatenate the data files later to restore the access.


git-svn-id: https://redoubt.ligo-wa.caltech.edu/svn/advLigoRTS/trunk@2930 6dcd42c9-f523-4c6d-aada-af552506706e