CarpetInterp/waveinterp_1p and CarpetInterp/waveinterp_2p tests are failing

The old tests CarpetInterp/waveinterp_1p and CarpetInterp/waveinterp_2p, which are almost identical apart from running on 1 or 2 processes, are both failing with the error

----------------------------------------------------------------
Iteration      Time | WAVEMOL::phi | *VEMOL::phit | *VEMOL::phix
                    |        norm2 |        norm2 |        norm2
----------------------------------------------------------------
        0     0.138 |         -nan |         -nan |         -nan
WARNING level 0 in thorn CarpetLib processor 0 host caltechcactusjenkins.spdns.org
  (line 428 of /home/jenkins/workspace/EinsteinToolkit/arrangements/Carpet/CarpetLib/src/gdata.cc): 
  -> Internal error: extrapolation in time.  variable=WAVEMOL::phi  time=0.20000000000000001  times=[0.40000000000000002,0.67500000000000004,0.27500000000000002]
WARNING level 0 in thorn CarpetLib processor 0 host caltechcactusjenkins.spdns.org
  (line 428 of /home/jenkins/workspace/EinsteinToolkit/arrangements/Carpet/CarpetLib/src/gdata.cc): 
  -> Internal error: extrapolation in time.  variable=WAVEMOL::phi  time=0.20000000000000001  times=[0.40000000000000002,0.67500000000000004,0.27500000000000002]

This test is newly failing because the dependent thorn WaveMoL has only just been added to the toolkit. The tests had a parameter setting WaveMoL::num_timelevels = 3 which didn't correspond to any WaveMoL parameter, so previously the tests would crash earlier. I removed that parameter setting, and now the tests fail with this "extrapolation in time" error. I don't understand this failure. The times array seems to be non-monotonic [0.4, 0.675, 0.275] perhaps indicating that it might not have been initialised correctly? The coarse grid timestep should be 0.1*0.25 = 0.025, so I don't see where these times come from during iteration 1. The NaNs in the norms are probably poison, which probably wasn't enabled when this test was written, so nobody noticed.

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