Better detection and reporting of errors in the table/tree data in a .rule file.
the geturl command can optionally unzip a downloaded zip file
tidied up some out-of-date Python installation docs
the getfiles command now returns nil if the given directory doesn't exist
added download.lua and documented recent changes
implemented a geturl function so Lua scripts can download a file from a given URL
updated makefile-mac to wx 3.2.7
removed the AGL framework from makefile-mac (no longer needed)