* jam_src/modules.c: (import_module, imported_modules): New functions.
* jam_src/builtins.c (builtin_import_module, builtin_imported_modules):
Just call the above.
* new/class.jam: Add some extra tests.
[SVN r19424]
* jam_src/builtins.c: New builtins IMPORT_MODULE and IMPORTED_MODULES.
jam_src/rules.c: (bindrule): Refactor. (lookup_rule): New function.
* kernel/modules.jam: Make use of IMPORT_MODULE.
[SVN r19422]
for getting the list of variable names and for clearing all rule and
variable storage.
* compile.c - better error reporting for unknown rules; now it is a
hard error.
* hash.c/h - added hash_free to allow removal of elements from a hash
* rule.c/h - implemented rule freeing; stopped exporting rules to the
global module by default.
* variable.c - reclaim variable storage when disposing of variable
hash.
* build.jam - make grammar building work under NT
[SVN r18405]
