retrieve 1.1.2

#[{pub_}mod_{pub_}use(a,b,c,...)] => {pub }mod a; {pub }use a::*; and also b,c,...
Documentation 
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pub mod m
{
 use retrieve::*;
 #[pub_mod_use(submodule_for_the_test)]
 #[test]
 fn test_in_situ()
 {
  // explicit sub-module namespace(mod + use)
  assert_eq!(submodule_for_the_test::VALUE, 123usize);

  // implicit sub-module namespace(pub mod)
  assert_eq!(VALUE, 123usize);
 }
}

#[test]
fn test_exo_situ()
{
 // access from the super-module(pub mod + use)
 assert_eq!(m::submodule_for_the_test::VALUE, 123usize);

 // The `m::VALUE` in this place should be compile error, but it is not an error for the `mod_use` pattern.
 // (Here I should originally test for a compile error, but the implementation is too cumbersome, it omitted.)
 // access from the super-module(pub mod + pub use)
 // assert_eq!(m::VALUE, 123usize);
}