Added the script 'dusort'. This script is similar to profile except that
with dusort you can profile the file sizes for a subset of files. To get
all of the files in a directory, type 'dusort *'. To get a subset, use
a wildcard with a file name. For example, for just text files, type
'dusort *.txt' or for just WRF out files, type 'dusort wrfout*'.

	new file:   dusort