debug: let dbg() be the universal thing to debug.

Therefore, we can use it directly on client objects. In this case, we
get full details.

rc.lua

@@ -36,6 +36,8 @@ function loadrc(name, mod)
    return result
 end
 
+loadrc("errors")		-- errors and debug stuff
+
 -- Global configuration
 modkey = "Mod4"
 config = {}
@@ -66,7 +68,7 @@ config.hostname = awful.util.pread('uname -n'):gsub('\n', '')
 -- Remaining modules
 loadrc("xrun")			-- xrun function
 loadrc("appearance")		-- theme and appearance settings
-loadrc("errors")		-- errors and debug stuff
+loadrc("debug")			-- debugging primitive `dbg()`
 
 loadrc("start")			-- programs to run on start
 loadrc("bindings")		-- keybindings