ctools

I modified ctulimit so that the name of the parameter that should be varied to compute an upper limit can be specified using the parname parameter (if the parname parameter is blank, which is the default, the standard behavior is obtained).

I then added an upper limit computation to csspec, using the respective intensity nodes for upper limit computation.

As reference, here the results obtained with SLICE:

2018-06-15T15:23:26:  Bin 1 .....................: 1.221688e-10 +/- 5.373786e-12 [< 1.759066e-10] erg/cm2/s (TS = 1069.409)
2018-06-15T15:23:26:  Bin 2 .....................: 1.067982e-10 +/- 4.919193e-12 [< 1.559900e-10] erg/cm2/s (TS = 1064.433)
2018-06-15T15:23:26:  Bin 3 .....................: 1.011262e-10 +/- 4.647995e-12 [< 1.476061e-10] erg/cm2/s (TS = 1131.287)
2018-06-15T15:23:26:  Bin 4 .....................: 8.776835e-11 +/- 4.286944e-12 [< 1.306378e-10] erg/cm2/s (TS = 1046.271)
2018-06-15T15:23:26:  Bin 5 .....................: 7.005584e-11 +/- 3.853282e-12 [< 1.085886e-10] erg/cm2/s (TS = 853.251)
2018-06-15T15:23:26:  Bin 6 .....................: 5.759921e-11 +/- 3.576058e-12 [< 9.335975e-11] erg/cm2/s (TS = 684.670)
2018-06-15T15:23:26:  Bin 7 .....................: 4.871038e-11 +/- 3.294468e-12 [< 8.165503e-11] erg/cm2/s (TS = 598.169)
2018-06-15T15:23:26:  Bin 8 .....................: 4.619379e-11 +/- 3.306368e-12 [< 7.925744e-11] erg/cm2/s (TS = 530.022)
2018-06-15T15:23:26:  Bin 9 .....................: 3.258974e-11 +/- 2.893858e-12 [< 6.152829e-11] erg/cm2/s (TS = 355.286)
2018-06-15T15:23:26:  Bin 10 ....................: 3.437429e-11 +/- 3.165327e-12 [< 6.602754e-11] erg/cm2/s (TS = 334.213)
2018-06-15T15:23:26:  Bin 11 ....................: 1.745382e-11 +/- 2.478647e-12 [< 4.224027e-11] erg/cm2/s (TS = 129.701)
2018-06-15T15:23:26:  Bin 12 ....................: 1.818815e-11 +/- 2.835562e-12 [< 4.654376e-11] erg/cm2/s (TS = 106.882)
2018-06-15T15:23:26:  Bin 13 ....................: 2.153167e-11 +/- 3.448843e-12 [< 5.602009e-11] erg/cm2/s (TS = 125.532)
2018-06-15T15:23:26:  Bin 14 ....................: 1.819759e-11 +/- 3.681961e-12 [< 5.501719e-11] erg/cm2/s (TS = 72.438)
2018-06-15T15:23:26:  Bin 15 ....................: 1.406384e-11 +/- 3.759826e-12 [< 5.166209e-11] erg/cm2/s (TS = 45.063)
2018-06-15T15:23:26:  Bin 16 ....................: 8.405661e-12 +/- 3.432607e-12 [< 3.710673e-11] erg/cm2/s (TS = 19.313)
2018-06-15T15:23:26:  Bin 17 ....................: 1.760389e-11 +/- 5.869693e-12 [< 7.527111e-11] erg/cm2/s (TS = 28.969)
2018-06-15T15:23:26:  Bin 18 ....................: 1.095723e-11 +/- 5.480227e-12 [< 5.062560e-11] erg/cm2/s (TS = 12.875)
2018-06-15T15:23:26:  Bin 19 ....................: No event in this bin. Likelihood is zero. Bin is skipped.
2018-06-15T15:23:26:  Bin 20 ....................: No event in this bin. Likelihood is zero. Bin is skipped.

And here the results obtained with NODES:

2018-06-20T12:22:30:  Bin 1 .....................: 1.184822e-10 +/- 5.292844e-12 [< 1.288262e-10] erg/cm2/s (TS = 915.397)
2018-06-20T12:22:30:  Bin 2 .....................: 9.877345e-11 +/- 8.090496e-12 [< 1.129407e-10] erg/cm2/s (TS = 963.351)
2018-06-20T12:22:30:  Bin 3 .....................: 1.037521e-10 +/- 8.612275e-12 [< 1.172088e-10] erg/cm2/s (TS = 1022.947)
2018-06-20T12:22:30:  Bin 4 .....................: 8.732752e-11 +/- 7.440398e-12 [< 9.928920e-11] erg/cm2/s (TS = 980.725)
2018-06-20T12:22:30:  Bin 5 .....................: 6.932707e-11 +/- 6.552495e-12 [< 8.014925e-11] erg/cm2/s (TS = 817.823)
2018-06-20T12:22:30:  Bin 6 .....................: 5.690113e-11 +/- 5.928023e-12 [< 6.702479e-11] erg/cm2/s (TS = 663.018)
2018-06-20T12:22:30:  Bin 7 .....................: 4.669816e-11 +/- 5.349441e-12 [< 5.583374e-11] erg/cm2/s (TS = 584.479)
2018-06-20T12:22:30:  Bin 8 .....................: 5.043362e-11 +/- 5.843732e-12 [< 6.062021e-11] erg/cm2/s (TS = 514.298)
2018-06-20T12:22:30:  Bin 9 .....................: 2.784513e-11 +/- 4.196655e-12 [< 3.525792e-11] erg/cm2/s (TS = 340.687)
2018-06-20T12:22:30:  Bin 10 ....................: 4.238384e-11 +/- 6.416659e-12 [< 5.330281e-11] erg/cm2/s (TS = 327.308)
2018-06-20T12:22:30:  Bin 11 ....................: 1.395996e-11 +/- 5.507698e-12 [< 2.022604e-11] erg/cm2/s (TS = 126.441)
2018-06-20T12:22:30:  Bin 12 ....................: 1.819095e-11 +/- 2.828206e-11 [< 2.687340e-11] erg/cm2/s (TS = 104.569)
2018-06-20T12:22:30:  Bin 13 ....................: 2.305891e-11 +/- 1.549247e-10 [< 3.419148e-11] erg/cm2/s (TS = 123.773)
2018-06-20T12:22:30:  Bin 14 ....................: 1.817868e-11 +/- 5.955930e-10 [< 2.977335e-11] erg/cm2/s (TS = 71.488)
2018-06-20T12:22:30:  Bin 15 ....................: 1.433521e-11 +/- 2.683171e-09 [< 2.718826e-11] erg/cm2/s (TS = 42.700)
2018-06-20T12:22:30:  Bin 16 ....................: 8.489549e-12 +/- 9.516030e-09 [< 2.135030e-11] erg/cm2/s (TS = 16.728)
2018-06-20T12:22:30:  Bin 17 ....................: 9.033159e-12 +/- 5.730817e-08 [< 3.844165e-11] erg/cm2/s (TS = 26.340)
2018-06-20T12:22:30:  Bin 18 ....................: 3.411845e-11 +/- 7.637511e-07 [< 9.115606e-11] erg/cm2/s (TS = 19.364)
2018-06-20T12:22:30:  Bin 19 ....................: 6.484044e-32 +/- 2.390080e-25 [< 2.605015e-12] erg/cm2/s (TS = 0.010)
2018-06-20T12:22:30:  Bin 20 ....................: 5.493459e-32 +/- 5.493459e-07 [< 1.359484e-20] erg/cm2/s

Code merged into devel.