File: insert_metadata_version.C

Function: 
The user can specify the version of the tests whose metadata he wants to 
update or insert. This version is specified as a command line argument to
the Root script

The macro iterates through every system test in that version and retrieves 
the histogram file and the standardtest_id of that test. For every histogram 
in the histogram file the mean, rms and the number of entries are calculated.
Using the standardtest_id the histogram of the standard is compared with the 
original to get the KS value.

A check is made to see if the values of the metadata are already present in the
metadata table for this system test. If yes then the table is updated and the
macro exists.

If the metadata is not present(i.e it has to be inserted) a check is first made
to see if the corresponding info/label is present in the info_labels table. If 
yes then the labels which already exist are retrieved and used to insert into 
the metadata table. If not then new labels are generated, inserted into the 
info_labels table and these are used to perform the insertion in the metadata
table.