[reportlab-users] Error in pdfmetrics.py trying to register the same encoding twice

[Matt Folwell]

There's code in pdfmetrics.py to cope if you try to register two 
identical encodings under the same name, but it doesn't work because 
Encoding.isEqual() doesn't take account of comparing an unfrozen 
encoding with a frozen one.  (The vector is converted from a list to a 
tuple)

Also the wrong error is raised when the encodings are different, because 
  the Encoding's Name attribute shouldn't be capitalised.

The attached patch against subversion head fixes both of these.

Regards,
Matt

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