UNTEX - converts the input tex file to ASCII
    RESULT = UNTEX(FILENAME,DIRECTORY) converts the input tex 
    files to ASCII, using untex filters suitable for unix systems 
    or microsoft windows systems and moves the converted 
    file into directory. 
    RESULT returns a success indicator, e.g. -2 if the 
    input file does not exist or has a wrong format, -1 
    if untex is not installed for unix users or 
    the untex.exe is missing for windows users, 0 if 
    untexing didn't work properly, and 1 if the 
    conversion was successful.
   
  Copyright 2011 Eugenia Maria Kontopoulou, Dimitrios Zeimpekis, 
                 Efstratios Gallopoulos