Add division by zero case to the `CheckedDiv` comment
Refactor BitV internals to not use macro, reduce duplication
Manual: add information about //!

Fixes #16569
work around MinGW linker bug for ASLR on Windows

Closes #16514
Explain modulo in the guide.

Fixes #15954
Fixing bitvset is_disjoint, fixes #16587
Make comment about small bias in %.

Fixes #16354.
Fix underflow bug in core::str::Searcher::new for haystacks of length < 20
Add a test for the fix of issue 16589
auto merge of #16364 : tbu-/rust/pr_checkeddiv0, r=alexcrichton
auto merge of #16582 : Gankro/rust/bitv, r=alexcrichton

This was bothering me (and some other people). The macro was necessary in a transient step of my development, but I converged on a design where it was unnecessary, but it didn't really click that that had happened.

This fixes it up.
auto merge of #16583 : steveklabnik/rust/gh16569, r=pcwalton

Fixes #16569
auto merge of #16585 : steveklabnik/rust/random_remarks, r=pcwalton

Fixes #15954 and #16354.
auto merge of #16588 : thestinger/rust/aslr, r=pcwalton

Closes #16514
auto merge of #16590 : nham/rust/str_searcher_underflow, r=alexcrichton

This incidentally fixes #16589, because it will cause `MatchIndices` to use `NaiveSearcher` instead of `TwoWaySearcher`, but I'm not sure #16589 should be closed until the underlying problem in `TwoWaySearcher` is found.
Cargo begins version number at 0.0.1 instead of 0.1.0
Cargo generates "Hello, world!" instead of "Hello world!"
`input_num` is used is used instead of `guess` further in the guide
Use new Cargo file syntax
Use new Cargo starting version number