new fix halt command, other sundry small bug fixes

examples/VISCOSITY/profile.13Oct16.einstein.2d.g++.1

@@ -0,0 +1,252 @@
+# Time-averaged data for fix avstress
+# TimeStep v_pxy v_pxx
+2000 0.0112152 -0.0107584
+4000 -0.00594131 0.00435131
+6000 0.00389329 -0.0277649
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+12000 0.00513669 -0.00119588
+14000 0.0231885 -0.00681743
+16000 0.00390478 0.0084919
+18000 -0.0326619 -0.00416449
+20000 -0.00297889 0.00926245
+22000 0.00997575 0.00581308
+24000 -0.0047041 -0.0119796
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+28000 -0.024339 0.01404
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+34000 0.0167514 0.00952851
+36000 0.00883586 0.010381
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+40000 0.0125036 0.00076643
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+44000 0.0215778 0.0189297
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+48000 -0.000156431 -0.0066786
+50000 -0.0047086 -0.00328836
+52000 -0.00605692 0.0195077
+54000 0.0247312 -0.0021608
+56000 -0.00511857 0.00419997
+58000 0.0045804 0.0280795
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+64000 0.00506313 0.010857
+66000 0.0233461 -0.0148928
+68000 3.57613e-05 0.0189441
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+72000 -0.00696381 -0.00396054
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+98000 9.68498e-05 0.0108188
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+160000 0.0171106 0.0259551
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