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Estimated hours taken: 30 A batch of changes related to the development of the new MLDS back-end. compiler/notes/compiler_design.html: Reorganize the documentation to reflect the multi-target / multiple back-end nature of the compiler. Document mlds.m and the new modules c_util.m and mlds_to_c.m. compiler/mlds_to_c.m: New module. This converts MLDS to C/C++ code. This version compiles, but it is still quite incomplete; there's lots of parts which are still not yet implemented. compiler/llds_out.m: compiler/c_util.m: Move some procedures from llds_out.m into a new module c_util.m, so that they can also be used by mlds_to_c.m. compiler/mlds.m: - Add new functions for use by mlds_to_c.m: * get_prog_context/1, for getting the prog_context from an mlds__context * get_module_name/1, for getting the module name from the mlds * module_name_to_sym_name/1, for converting an mlds_module_name to a sym_name - Change the mlds__func_signature type to * allow multiple return values, for consistency with the MLDS `return' statement; * include the names of the parameters. - Undo the premature over-optimization of making the `constness' and `finality' flags share the same flag bit.