SL-315 - arche_tool.py updates, resetSkeleton() now preserves mPelvis state, forces all params to be updated.

SL-375, SL-378 - rudimentary logging info to list joint offsets during mesh import. dae_tool.py work to enable joint offset tweaking.

SL-344 - fixed a problem in avatar_lad with some params in wrong group, added diagnostics to make this easier to detect.

SL-338 - added --set_version to anim_tool.py, for creating files to test upload of unsupported file versions.

Ensure that AUTOBUILD is always in native path syntax on every platform.
Remove local build.sh logic to infer AUTOBUILD: either the generic build.sh
has set it properly, or scream for help.
Since cygwin bash scripts need a cygwin-syntax path to autobuild, convert to a
local 'autobuild' variable using shell_path.
Remove kludges in other languages involving cygdrive twiddling.

Hopefully this will make certain errors clearer, notably failure to launch
autobuild due to "cannot find the file specified".