jammdb rewrite

[pjtatlow]

Complete rewrite of the database to remove a ton of unsafe code.

Deleted the Ptr struct, and store buckets and nodes in a more idiomatic way rather than using unsafe pointers.

Stops copying the bytes written to the database, to vectors and using unsafe pointers to refer to them. Instead uses the ToBytes trait to safely accept a &[u8] as long as it outlives the transaction. You can also pass in a Vec or a bytes::Bytes and they will not be copied.

[codecov]

Codecov Report

Base: 92.90% // Head: 94.74% // Increases project coverage by +1.83% 🎉

Coverage data is based on head (3e902fa) compared to base (c795af4).
Patch coverage: 95.16% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
+ Coverage   92.90%   94.74%   +1.83%     
==========================================
  Files          18       21       +3     
  Lines        1790     3614    +1824     
==========================================
+ Hits         1663     3424    +1761     
- Misses        127      190      +63     

Impacted Files	Coverage Δ
src/errors.rs	20.68% <0.00%> (-8.48%)	⬇️
tests/common/record.rs	86.22% <86.22%> (ø)
src/data.rs	88.23% <88.23%> (-5.19%)	⬇️
src/tx.rs	88.45% <88.45%> (ø)
src/page_node.rs	89.65% <89.65%> (ø)
src/bytes.rs	90.66% <90.66%> (ø)
tests/multiple_txs.rs	94.64% <94.11%> (+0.64%)	⬆️
src/db.rs	94.63% <95.04%> (+5.65%)	⬆️
tests/common/mod.rs	95.45% <95.45%> (-4.55%)	⬇️
src/node.rs	95.82% <95.82%> (+5.82%)	⬆️
... and 23 more

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