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FMMlib backend loses digits

pycl test_layer_pot_identity.py  'test_identity_convergence(cl._csc,SphereGreenTest())'

FMMlib, order 20:

h                  |Error           |Running EOC
-------------------+----------------+--------------
0.7926660362446749 |0.0159542558703 |
0.42409160875182805|0.00934152065255|0.855790914652
Overall EOC: 0.855790914652

FMMlib, order 10:

h                  |Error            |Running EOC
-------------------+-----------------+-------------
0.7926660362446749 |0.000828135207776|
0.42409160875182805|0.000266219214214|1.81445648881
Overall EOC: 1.81445648881

Sumpy, order 10:

h                  |Error            |Running EOC
-------------------+-----------------+-------------
0.7926660362446749 |0.000649110885086|
0.42409160875182805|0.000112837136995|2.79742751924
Overall EOC: 2.79742751924

cc @mattwala