Rename the 'cfg' module to 'flowgraph'.

The 'cfg' name was easy to confuse with 'configuration'.

lib/cretonne/src/lib.rs

@@ -10,7 +10,7 @@ pub use write::write_function;
 /// Version number of the cretonne crate.
 pub const VERSION: &'static str = env!("CARGO_PKG_VERSION");
 
-pub mod cfg;
+pub mod flowgraph;
 pub mod dominator_tree;
 pub mod entity_list;
 pub mod entity_map;