Please tolerate the preamble!

I would like to encourage people to use the instrument-instance
parallelism in csound as it offers performance gains.  It works best
for large values of ksmps.

To encourage the use of large ksmps cs6 provided the --sample-accurate
mode.  However the problem of zipper type noise remains.  In an
attempt to obviate that issue I have started to generalise the filters
so more of them can take a-rate parameters.

Following the biquad/biquada differences there are now (in
git/develop) 4 versions of areson allowing all combinations of a- and
k-rate centre frequency and bandwidth.  Also atone and tone will now
take a or k-rate half-power frequency.

I have also written lowpass2, lowres and moogladder variants.  What I
really need is testing.  I know that the code compiles but I have not
tested carefully, and my ears are not very good.  Please can some of
you do some of the testing?  It is very likely that I have got
something wrong.

Syntax is like earlier filters but the argument type determines which
variant is used.

It is my intention to add more filters like this over time; some look
easy but some look rather difficult.

==John ffitch

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Thanks John, that will be beer useful.

Regards,
Mike