small updates

'lua_pushglobaltable' returns 'void'

format "%s" in 'string.format' accepts embedded zeros when it

has no modifiers

bug in order NaN x int (tests must ensure that NaN does not get

converted to integer)

'setkey' -> 'setnodekey' (to avoid conflicts with POSIX)

detail (using 'sizeof' instead of 'strlen' for length of a constant

string)

release changed to (5.3) alpha

details (typos in comments)

logic for checking mode for 'fopen' moved to macro 'lua_checkmode'

bugs: Internal Lua values may escape through the debug API +

Problems when yielding from debug hooks