Move the mpi.h include outside of the __cplusplus check.
Fixed tw_event_send() to check for out of bounds event sends.
Elsa uses the functionality that we "fixed" so...  Yeah.
Revert "Fixed tw_event_send() to check for out of bounds event sends."

This reverts commit 69ea5e941522257d9cd5e1f77302f16d172866aa.