Rename subname argument to name, and mark it as constant.

Document also the find_module() function

Document also that dynamic module names are ASCII only

 * Document the function
 * Use RegQueryValueW() instead of RegQueryValueA()
 * Use _Py_fopen() instead of fopen()
 * Allocate registry key on the heap, not on the stack, and handle memory
   allocation failure
 * Handle Python exception in find_module()

The name is an ASCII encoded string.

_PyImport_FixupBuiltin() and _PyImport_FindBuiltin() use
PyUnicode_InternFromString() instead of PyUnicode_FromString().

 - is_builtin(), init_builtin(), load_builtin() and other builtin related
   functions use Unicode strings, instead of byte strings
 - Rename _PyImport_FixupExtensionUnicode() to _PyImport_FixupExtensionObject()
 - Rename _PyImport_FindExtensionUnicode() to _PyImport_FindExtensionObject()

find_frozen(), get_frozen_object(), is_frozen_package() and other functions
related to frozen modules use Unicode strings instead of byte strings.

Replace strcmp() by PyUnicode_CompareWithASCIIString()

 - Use Unicode for module paths and names, self->archive and self->prefix
 - Format module names and paths use %R instead of '%U' to escape surrogate
   characters (PEP 383)
 - Use PyImport_ExecCodeModuleObject() instead of PyImport_ExecCodeModuleEx()
 - Use PyImport_AddModuleObject() instead of PyImport_AddModule()

Call unfakehttp in order to close connection while opening the connection through a fakehttp object.
Address issue11609 - urllib related buildbots failure.

unbuffered pipes, such that select() works properly on them.

unbuffered pipes, such that select() works properly on them.

unbuffered pipes, such that select() works properly on them.