Development tools

We've discontinued ldrel. The main use for ldrel was to set a default stack size, but you can use elfnote for that. This utility has -S and -L options behave like those for ldrel. For everything else, use the binutils (objcopy and objdump).
We've upgraded from Python 2.5 to Python 2.7.12. If you have any custom Python-based tools that run on your host, you may need to modify your code. In this release, you can also run Python scripts on target in addition to your host. For a summary of what's new in Python 2.7, see the What's New in Python 2.7 page on the Python Software Foundation documentation website; https://docs.python.org/2.7/index.html.