fix commandToClient, handle net strings when passed to lua, misc readme additions

src/util/libbl.lua

@@ -194,6 +194,10 @@ local function valFromTs(val, name, name2)
 	-- vector, box, or axis->matrix
 	local vec = multinumericFromTs(val)
 	if vec then return vec end
+	-- net string
+	if val:sub(1,1)=='\x01' then
+		return _bllua_ts.call('getTaggedString', val)
+	end
 	-- string
 	return val
 end
@@ -676,7 +680,7 @@ luaLookup = function(tbl, name, set, val)
 		local first, rest = name:match('^([^%.:]+)%.(.+)$')
 		if not isValidFuncName(first) then
 			error('luaLookup: invalid name \''..tostring(first)..'\'', 3) end
-		if not tbl[first] then
+		if tbl[first]==nil then
 			if set then tbl[first] = {}
 			else return nil end
 		end
@@ -691,7 +695,7 @@ luaLookup = function(tbl, name, set, val)
 			error('luacall: invalid method name \''..tostring(first)..'\'', 3) end
 		if not tbl[first] then
 			error('luacall: no object named \''..rest..'\'', 3) end
-		if not tbl[first][rest] then
+		if tbl[first][rest]==nil then
 			error('luacall: no method named \''..rest..'\'', 3) end
 		return function(...)
 			tbl[first][rest](tbl[first], ...)
@@ -790,8 +794,9 @@ function bl.commandToServer(cmd, ...)
 		_bllua_ts.call('addTaggedString', cmd),
 		unpack(arglistToTs({...})))
 end
-function bl.commandToClient(cmd, ...)
+function bl.commandToClient(client, cmd, ...)
 	_bllua_ts.call('commandToClient',
+		valToTs(client),
 		_bllua_ts.call('addTaggedString', cmd),
 		unpack(arglistToTs({...})))
 end