lisa.pelt: Fix plet_settling_time()
FIX
pelt_settling_time() was quite broken as the curve it implemented was rotated 180 degrees from what it should.
Fix it with correct support for non-zero initial condition and support for init > final.
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FIX
pelt_settling_time() was quite broken as the curve it implemented was rotated 180 degrees from what it should.
Fix it with correct support for non-zero initial condition and support for init > final.