[IMP-dev] Exception cleanup and mover cleanup

[Daniel Russel <>]

The first patch
- moves the exception definitions to a new header (IMP/exception).  
log.h includes this so no other headers have to change directly. As a  
side effect, exceptions are no longer exported to python. We can  
revert this easily enough
- adds a IMP::Exception base class for all exceptions which stores a  
string and implements what() so the the string is passed to python
- all exceptions (except ErrorException) now require a string (or  
const char*) in their constructor so that python gets the message
- adds a ValueException to thrown when you have out of range values. I  
was throwing other more awkward ones before

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the second patch cleans up comments in the movers and adds methods to  
set the radius/standard deviation.

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As a side note, don't we want IMPDLLEXPORT on Linear? As it is, you  
end up with two separate copies of the class, on in libimp and one in  
_IMP. Not catastrophic, but probably not what we want. Such a problem  
appears to be catastrophic with exceptions :-)