Rebuild pre-release onto current upstream.

Remaining changes are basically just the ihex_byte_copy() API.

Rebuild pre-release onto current upstream.

Include new upstream fixes and the new common record iterating code,
used where applicable including the ihex_byte_copy() API.

Rebase pre-release onto current upstream.

Updated to include the new upstream build system based on GNU
autotools.

First stable version of API extension usable for other projects.

This version was published and used in other projects, so we keep this
tag as a reference.