saugns v0.3.6b. Redesign. Fix v0.3.6 modulator list bug.

Extend the v0.3.4-v0.3.6 redesigns further,
using a common nodelist module for parser
and parseconv output, and moving handling
of specific modulator lists to scriptconv.

Fix v0.3.6 bug introduced when removing ADJCS flag.
Ensure that cleared modulator lists are produced
and set when clearing modulator lists in script.

Add 'devtests/pm-addremaddrem.sau' (which
tests adding and clearing PM modulators).
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