Added permutations and ranges to test defines

This is really more work for the bench runner. With this change defines
can be manipulated at a rather high level at runtime. Which should be
useful for generating benchmarks across various dimensions.

The define grammar in the test_runner is now a bit more powerful,
accepting:

1. A single value: -DN=42
2. A list of values, which get permuted: -DN=1,2,3
3. A range: -DN=range(10)
4. Some combo: -DN=1,2,range(3,0,-1)

This is more complex in the test .toml defines, which can also be C
expressions:

1. A single value: define=42
2. A single expression: define='42*42'
3. A list: define=[1,2,3]
4. A comma separated string: define='1,2,3'
5. A range: define='42*range(10)'
6. This mess: define=[1,2,'3,4,range(2)*range(2)+3']

tests/test_truncate.toml

@@ -285,7 +285,7 @@ code = '''
 
 # more aggressive general truncation tests
 [cases.aggressive_truncate]
-defines.CONFIG = [0,1,2,3,4,5]
+defines.CONFIG = 'range(6)'
 defines.SMALLSIZE = 32
 defines.MEDIUMSIZE = 2048
 defines.LARGESIZE = 8192