removes the current timer env from the stack
for each rm_timer_env there should have been the symmetric call to add_timer_env
SUBROUTINE rm_timer_env()
!! removes the current timer env from the stack
!! @note
!! for each rm_timer_env there should have been the symmetric call to
!! add_timer_env
TYPE(timer_env_type), POINTER :: timer_env
timer_env => list_pop(timers_stack)
CALL timer_env_release(timer_env)
IF (list_size(timers_stack) == 0) CALL list_destroy(timers_stack)
END SUBROUTINE rm_timer_env