Do not stop opening files if one of them is already open; core/file_io.lua
Updated to Lua 5.2.3; src/Makefile
Updated src/lua.patch for Lua 5.2.3.
Updated to Scintilla 3.3.7.
Added dummy `flush()` for processes in experimental winapi; core/file_io.lua
Updated LuaDoc; core/.buffer.luadoc
Enable read-only access to the current chain of key sequences; core/keys.lua
Renamed "hypertext" lexer to "html".