This relies on a working cross-compiler, of course, as well as a separate build
directory for cross-compiled builds, with DFHACK_NATIVE_BUILD_DIR pointing
to an already-successful native build directory (this is needed for protoc).
GCC 5 mangles some symbols, such as "plugin_globals" ->
"plugin_globals[abi:c++11]" (or "_Z14plugin_globalsB5cxx11"), even
when declared with 'extern "C"'. This breaks plugins, in particular.
Having the docs index in the repo root was a holdover from when it was
the README file. Now that it's not much use without being built, it's
better to leave the root to README, NEWS, and LICENSE - especially when
one is a html shortcut to the docs index.
The root of the documentation tree has a different function to the short
readme we want to display on GitHub, which now links to the main docs
(or Bay12 thread, or IRC). It also renders properly on GitHub, and can
use live-updating status badges because we don't expect it to work
offline.
Building the docs now works the same way, no matter when it happens - in
a cloned repo or distributed version.
This means all the relative links keep working; and that users or
downstream distributors can rebuild the docs with extra scripts or .rst
files in place.
Finally, it eliminates a large number of potential bugs which only occur
in one build environment and are difficult to reproduce.
Also add headings and this work to future news.
This mainly involved tweaking a few filenames and configuration paths to
allow consistency in all scenarios. It cleared up a few errors in the
process too!
I also clarified the placement of the LICENSE file, and finished
configuring the Alabaster style. This required moving some stuff out of
the CMake system to conf.py to avoid later breakage.