Merge from genscripts r451: douglasjanderson

Merge from genscripts r451: douglasjanderson
Revert r438 because the problem it addresses can be taken care of more robustly.

Merge from genscripts r449: douglasjanderson
Make some modifications to fix bug #309091

Merge from genscripts r438: brian.dolbec
rework the dpendencies _parser() tok == '' trap in an attempt to trap the
InvalidAtom error, add '' removal from matches in query, add more detail in the
error from Atom, add a trap to skirt around a null atom in the ChangeLog class.
Hopefully I either solved it or have it printing out more info this time.

Merge from genscripts r436: brian.dolbec
fix the error in the raising of the GentoolkitInvalidAtom error, find and change
the info printed out in the error message to help track down the problem.

Merge from genscripts r435: brian.dolbec
modify the tok if statement as it didn't catch the error the user was using to
print out additional info

Merge from genscripts r434: brian.dolbec
try to solve an svn diff! Invalid Atom, '' error a user is getting running
equery depends.  this should intercept the empty tok before and print out more
useable info to determine if it should be an error or should be ignored, etc.

svn path=/trunk/gentoolkit/; revision=802