changed buffer reader values in combineTBT to accept only 1 file input. 
It was throwing an error because it kept trying to access an invalid
arraylist element when it expected 2 files but was only fed one.
Bug in modifyKey2File would try to parse and access array elements even
if the line being fed was blank.  Added code to check if line being read
was blank, and if so to skip the line and warn the user.  The end
product was not affected, so this fix is just to prevent errors being
thrown to the screen and handle seeing the input error more
conscientiously.
20130226 update;bug corrections in modifying read 2 key file;accepts only one lane of data