Minor Changes for 10.5.8 OSX builds.

This commit includes changes specifically to accommodate some
compiler warnings generated when building in OS X 10.5.8 ("Leopard").

Mainly, a static constant initializer that is not of the 'integral'
type was moved to the 'cut.cpp' file.

Also, wxID's are signed, so any arguments that take these have been
changed from 'UINT' to simply 'INT'.