0.5.1

The main change in this release is a new mechanism for tracking very coarse-grained memory usage statistics (#241). The interface is only exposed in malloc-extensions.h. We recommend static linking this API, as we may refine this in future releases.

Other changes:

• PALs now fully static (#245)

Bug fixes:

• Haiku Debug build fixed (#247)
• Windows Clang CTZ was not defined on correct size for size_t (#242)
• Fix to unit tests (#239)
• FlatPageMap calculated too large size if payload was not a byte size (#236)