0.9.1

Added more example code to fiview.log output, including a
compiler-optimised version, and also example code to generate other
filters in the same class at run-time.  Most of the other changes were
internal code reorganization and clean-up to support these additions,
plus code in fidlib to generate the required coefficients at run-time.
Also now displays better filters that go on forever (for example
oscillators like BpRe/0/0.01).

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0.9.0

Initial release