A number of small script fixes/tweaks from usage

- Fixed prettyasserts.py parsing when '->' is in expr

- Made prettyasserts.py failures not crash (yay dynamic typing)

- Fixed the initial state of the emubd disk file to match the internal
  state in RAM

- Fixed true/false getting changed to True/False in test.py/bench.py
  defines

- Fixed accidental substring matching in plot.py's --by comparison

- Fixed a missed LFS_BLOCk_CYCLES in test_superblocks.toml that was
  missed

- Changed test.py/bench.py -v to only show commands being run

  Including the test output is still possible with test.py -v -O-, making
  the implicit inclusion redundant and noisy.

- Added license comments to bench_runner/test_runner

tests/test_superblocks.toml

@@ -36,7 +36,7 @@ code = '''
 
 # expanding superblock
 [cases.test_superblocks_expand]
-defines.LFS_BLOCK_CYCLES = [32, 33, 1]
+defines.BLOCK_CYCLES = [32, 33, 1]
 defines.N = [10, 100, 1000]
 code = '''
     lfs_t lfs;
@@ -70,7 +70,7 @@ code = '''
 
 # expanding superblock with power cycle
 [cases.test_superblocks_expand_power_cycle]
-defines.LFS_BLOCK_CYCLES = [32, 33, 1]
+defines.BLOCK_CYCLES = [32, 33, 1]
 defines.N = [10, 100, 1000]
 code = '''
     lfs_t lfs;
@@ -108,7 +108,7 @@ code = '''
 
 # reentrant expanding superblock
 [cases.test_superblocks_reentrant_expand]
-defines.LFS_BLOCK_CYCLES = [2, 1]
+defines.BLOCK_CYCLES = [2, 1]
 defines.N = 24
 reentrant = true
 code = '''