Add a solver for complex-valued systems

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+++ new
@@ -1 +1,12 @@
-ideas: Newton propagator (time-independent systems only) or SIL propagator
+#####What and Why#####
+
+For open quantum systems, a solver that is more efficient than the standard ODE solvers would be nice. One such example is Peter's solver based on Newton polynomials.
+
+#####TODO#####
+
+* Understand how the time evolution with Newton polynomials works
+    * Input parameters
+    * error bounds and scaling
+* Implement a solver that uses Newton polynomials
+* Add a demo or convert an existing demo that uses Newton polyomials
+* Follwup ticket: Use a SIL solver?

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@@ -10,3 +10,9 @@
 * Implement a solver that uses Newton polynomials
 * Add a demo or convert an existing demo that uses Newton polyomials
 * Follwup ticket: Use a SIL solver?
+
+----
+
+* Used a solver based on Faber polynomials; these looked easier to understand and handle.
+* also added some helper functions related to guessing the spectrum and truncating operators
+* new demo LinearRamp as an example