Fixed a bug in the part of the code that computes Pn/Sn travel times for mantle events. The bug caused the code to hang for events just below the Moho and close to the receiver. The test events seemed to return very similar travel times for very small differences in ray parameter. The bug was fixed by simply adding a counter that caused the loop to quit after a specified number of iterations.

Removed a spurious debug print statement that was inadvertently left in the Fortran shell interface.

Added tests for ellipticity corrections and elevation corrections. The results of these tests had been distributed previously, but are now part of the official release.