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This also strips trailing whitespace that was present in the files.

In Python 3, reading fails if files are not valid utf-8.  I think this
is a good thing, because it is not safe to parse files with an unknown
encoding.  This new code will print the filename before printing the
exception and exiting.

The previous code assumed that any line ending with ":" was a label,
such as "case 10:", but some lines aren't, such as "class x :".

We only want to change the indentation of braces for code blocks,
not for initializer lists.

The purpose of this utility is to set the brace indentation for
VTK source files.