[IMP-dev] exception cleanup

[Daniel Russel <drussel@salilab.org>]

I changed how the check and assert macros work slightly. The former  
now takes an exception type name as its third argument (instead of an  
instructor call). The exception is created with the error message  
passed as the second argument to check (removing the need to specify  
the message twice). Also, the file and line number are added to the  
assertion error message.
Finally, by default the error message is not printed, just passed to  
the exception. Python will print the error message from the exception  
anyway.

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