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Estimated hours taken: 10 Allow modules to be put in source files whose names do not directly match their the module names. When looking for the source for a module such as `foo:bar:baz', search for it first in `foo.bar.baz.m', then in `bar.baz.m', and finally in `baz.m'. compiler/prog_io.m: Change prog_io__read_module so that it returns the name of the module read, as determined by the `:- module' declaration. Add predicate `check_module_has_expected_name', for checking that this name matches what was expected. compiler/modules.m: Add read_mod_from_file, for reading a module given the file name, and generated_file_dependencies, for generating the dependencies of a module given the file name. (As opposed to the module name.) Change read_mod and read_mod_ignore_errors so that they search for `.m' files as described above, and return the name of the source file read. Also improve the efficiency of read_dependencies slightly: when reading in `.int' files, there's no need to call split_into_submodules, because we generate a seperate `.int' file for each submodule anyway. compiler/mercury_compile.m: Change the handling of command-line arguments. Arguments ending with `.m' are assumed to be file names, and other arguments are assumed to be module names. For file names, call read_mod_from_file instead of read_mod. compiler/handle_options.m: Change help message to reflect the above change to the semantics of command-line arguments. compiler/intermod.m: compiler/trans_opt.m: Fix a bug: call prog_io__read_opt_file instead of prog_io__read_module. doc/user_guide.texi: Document the above change to the semantics of command-line arguments. Update the "libraries" chapter to reflect our support for nested modules. tests/*/*.m: tests/*/*.exp: Fix a few incorrect module names in `:- module' declarations.