Make fixes, improvements, and chibicc python bindings

- python now mixes audio 10x faster
- python octal notation is restored
- chibicc now builds code 3x faster
- chibicc now has help documentation
- chibicc can now generate basic python bindings
- linenoise now supports some paredit-like features

See #141

third_party/dlmalloc/README.cosmo

@@ -1,15 +1,21 @@
-Numerous local changes were made while vendoring Doug Lee's original
-dlmalloc sources. Those changes basically boil down to:
+ORIGIN
 
-  1. Fewer #ifdefs
-  2. More modules (so linker can do a better job)
-  3. Delete code we don't need (cf. Knight Capital)
-  4. Readability / stylistic consistency
+  http://gee.cs.oswego.edu/
 
-Since we haven't made any genuine improvements to Doug Lee's legendary
-allocator, we feel this folder faithfully presents his intended work, in
-harmony with Cosmopolitan conventions.
+LOCAL CHANGES
 
-The only deleted code we're sure has compelling merit is the mspace
-functionality. If we ever need memory pools, they might be more
-appropriately vendored under //third_party/dlmalloc_mspace.
+  Numerous local changes were made while vendoring Doug Lee's original
+  dlmalloc sources. Those changes basically boil down to:
+
+    1. Fewer #ifdefs
+    2. More modules (so linker can do a better job)
+    3. Delete code we don't need (cf. Knight Capital)
+    4. Readability / stylistic consistency
+
+  Since we haven't made any genuine improvements to Doug Lee's legendary
+  allocator, we feel this folder faithfully presents his intended work, in
+  harmony with Cosmopolitan conventions.
+
+  The only deleted code we're sure has compelling merit is the mspace
+  functionality. If we ever need memory pools, they might be more
+  appropriately vendored under //third_party/dlmalloc_mspace.