Version 0.3

• Added --with-malloc-wrapper and --with-fixed-allocator flags for ./configure.
• Added a fixed allocator support -- if the user does not want to override at runtime the allocators used by smalloc/sfree and just want to use malloc and free, they may enable this option using the --with-fixed-allocator configuration flag.
• Added malloc/free wrappers. Pointers produced by malloc can be used with the smart attribute, and smart pointers may be passed to free. This option is deactivated by default, and can be enabled using the --with-malloc-wrapper configuration flag.