Fixed test Test_FdbKey_Constants()
MemoryDB: Added USlice.Equal(obj) and USlice.GetHashCode() methods
MemoryDB: removed db.LoadSnapshotAsync(..) because overwriting an existing db instance is too dangerous

- must use MemoryDatabase.LoadFromAsync(...) instead
MemoryDB: refactoring on the memory layout of keys and values (work in progress) and heap allocation strategy

- Reduce the size of the flags to make more room in keys and values
- Use buckets for different page size in the heap
- Added default System Keys in new empty dbs
Fix for a weird Roslyn compilation bug that breaks tuple encoding of string with NUL chars

- If the call to WriteNulEscapedBytes(...) is outside the fixed statement, it is not present in the generated IL code for the method (!?)
First step to fixing bug with Take(N).Reversed() and initial implementation of Skip()

- still need to fix possible range overflow bug
Added failing test for GetRange() + Take() + Reversed() that should not overflow
Fix Test_Can_Bulk_Insert_Raw_Data() unit test that was failing on slow hosts

- need to wait for the last progress notification, because it is invoked asynchronously
- added a note in the XML docs to remind that progress.Report(x) may be called after the task has completed
FdbKeySelector now implements IEquatable<FdbKeySelector> as well as the == and != operators
Added a bound check step in range queries when the currents bounds are not equal to the original range.

- call GetKeys(...) to resolve to actual keys, and bound check them before starting the range read.
- this should fix the overflow bug for non typical queries that mix Take(), Skip() and Reverse()
Fixed intermitent failure in FdbCounter

- needs to use the Rng under a lock (not thread-safe!)
- coalesce thread was not resetting the flag to 0 if it failed to start
Common Layers: [BREAKING CHANGE] renamed FdbTable to FdbMap and moved to namespace FoundationDB.Layers.Collections

- Tables have rows and columns, Maps avec keys and values
- Frees up the name "Table" for an actual layer about rows or column oriented tables.
- How to fix this breaking change: search/replace "FdbTable" to "FdbMap" and "FoundationDB.Layers.Tables" to "FoundationDB.Layers.Collections"
Async Linq: fixed missing "this" on AggregageAsync extensions methods, added ToDictionaryAsync() implementation
Fix typo in SliceComparer.Equals()
Cleaned up names in FdbMap unit test (table->map)
MemoryStore: a little bit of cleanup
Fixed a few XML comments and args names
Added missing PrintLine() in Logging.Exception(...) method
Fixed SliceListStream.Seek(..) method

- implementation seemed to be unfinished ?
Fixed SliceStream that was not passing the cancellationToken to the underlying stream when writing