Improve ChordLindenmayer class with Scales and more intelligible commands

[gogins]

I suspect I never really finished the ChordLindenmayer class. When I tried to use it, I wanted Scales and I wanted it to be easier to use, but the turtle commands proved hard to understand.

• [x] Add a Scale and a scale degree to the turtle state.
• [x] Add random variables to the arithmetic operations.
• [x] Enclose the turtle commands in Lisp-style parentheses, and make their syntax much more intelligible.
• [x] Improve the documentation.
• [x] Fix the Embind interface.
• [x] Write a C++ piece/unit test.

[gogins]

Pieces using some version of ChordLindenmayer:

/home/mkg/Csound-Book/2011_Second_Printing_NEW_DVD_Master/02_Csound_5_13_Sources/Csound5.13.0/frontends/CsoundAC/ChordLindenmayerTest.py:417:        print 'UNIT TESTS FOR CsoundAC.ChordLindenmayer...'
/home/mkg/Dropbox/2006-ICMC-MKG/PTVLindenmayerTest.py:34:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/chords-2006-07-12-a.py:38:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/icmcpiece.py:38:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/icmcpiece1.py:42:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/icmcpiece2.py:38:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/icmcpiece3.py:38:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/lindenmayer.py:26:class ChordLindenmayer(CsoundVST.ScoreNode, tonnetz.Tonnetz):
/home/mkg/Dropbox/2006-ICMC-MKG/progression1.py:41:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/samplepiece.py:38:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/sequence.py:31:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/sequence2.py:40:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/simple.py:27:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/simple_tied.py:27:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/vcommands.py:32:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/2006-ICMC-MKG/vrltest.py:30:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/Dropbox/studio/01_workshop/pvtlindenmayer.py:34:# Place the ChordLindenmayer node inside a Random node to randomize velocity and pan,
/home/mkg/csound-extended/CsoundAC/ChordLindenmayerTest.py:417:        print 'UNIT TESTS FOR CsoundAC.ChordLindenmayer...'
/home/mkg/csound-extended/WebAssembly/examples/Parachronic_CsoundAC.html:926:    let lindenmayer = new CsoundAC.ChordLindenmayer();
/home/mkg/michael.gogins.studio/_site/music/ChordLindenmayer/ChordLindenmayerTest.cpp:25:    csound::ChordLindenmayer lindenmayer;
/home/mkg/michael.gogins.studio/_site/music/Diachronic/Diachronic.cpp:64:    csound::ChordLindenmayer lindenmayer;
/home/mkg/michael.gogins.studio/music/ChordLindenmayer/ChordLindenmayerTest.cpp:25:    csound::ChordLindenmayer lindenmayer;
/home/mkg/michael.gogins.studio/music/Diachronic/Diachronic.cpp:64:    csound::ChordLindenmayer lindenmayer;
/home/mkg/michael.gogins.studio/music/Parachronic/CsoundAC-HTML-Demo.html:65:    let lindenmayer = new CsoundAC.ChordLindenmayer();

[gogins]

None of these is really suitable. I will do one from scratch. It will be as short as possible consistent with exercising the features.