Display additional ("aux") information and stacks

[jfrimmel]

This improves the output of cases like #74 by outputting the additional information present in the valgrind output. The results are looking like this:

       Error Invalid read of size 4
        Info main stack trace (user code at the bottom)
             at core::fmt::num::imp::<impl core::fmt::Display for i32>::fmt (num.rs:317)
             at core::fmt::num::<impl core::fmt::Debug for i32>::fmt (num.rs:195)
             at <&T as core::fmt::Debug>::fmt (mod.rs:2368)
             at {closure#0} (builders.rs:505)
             at {closure#0}<core::fmt::builders::{impl#6}::entry::{closure_env#0}> (builders.rs:430)
             at and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#5}::entry_with::{closure_env#0}<core::fmt::builders::{impl#6}::entry::{closure_env#0}>> (result.rs:1346)
             at entry_with<core::fmt::builders::{impl#6}::entry::{closure_env#0}> (builders.rs:416)
             at core::fmt::builders::DebugSet::entry (builders.rs:505)
             at core::fmt::builders::DebugList::entries (builders.rs:695)
             at <[T] as core::fmt::Debug>::fmt (mod.rs:2618)
             at <&mut T as core::fmt::Debug>::fmt (mod.rs:2372)
             at fmt (rt.rs:173)
             at core::fmt::write (mod.rs:1182)
             at write_fmt<std::io::stdio::StdoutLock> (mod.rs:1827)
             at <&std::io::stdio::Stdout as std::io::Write>::write_fmt (stdio.rs:787)
             at write_fmt (stdio.rs:761)
             at print_to<std::io::stdio::Stdout> (stdio.rs:1117)
             at std::io::stdio::_print (stdio.rs:1227)
             at issue_74::ex4 (issue-74.rs:34)
             at issue_74::main (issue-74.rs:66)
        Info Address 0x4aa3b28 is 0 bytes after a block of size 24 alloc'd
             at malloc (vg_replace_malloc.c:446)
             at alloc::alloc::alloc (alloc.rs:100)
             at alloc::alloc::Global::alloc_impl (alloc.rs:183)
             at <alloc::alloc::Global as core::alloc::Allocator>::allocate (alloc.rs:243)
             at alloc::raw_vec::RawVec<T,A>::try_allocate_in (raw_vec.rs:230)
             at with_capacity_in<i32, alloc::alloc::Global> (raw_vec.rs:158)
             at with_capacity_in<i32, alloc::alloc::Global> (mod.rs:699)
             at with_capacity<i32> (mod.rs:481)
             at <alloc::vec::Vec<T> as alloc::vec::spec_from_iter_nested::SpecFromIterNested<T,I>>::from_iter (spec_from_iter_nested.rs:54)
             at <alloc::vec::Vec<T> as alloc::vec::spec_from_iter::SpecFromIter<T,I>>::from_iter (spec_from_iter.rs:33)
             at <alloc::vec::Vec<T> as core::iter::traits::collect::FromIterator<T>>::from_iter (mod.rs:2977)
             at core::iter::traits::iterator::Iterator::collect (iterator.rs:2005)
             at issue_74::ex4 (issue-74.rs:27)
             at issue_74::main (issue-74.rs:66)
             at core::ops::function::FnOnce::call_once (function.rs:250)
     Summary Leaked 0 B total (1 other errors)