fix: move commands initilization from global init to local

If we call addAllCommands in initGlobalSettings, all
the readers will share the same commands and we cannot
adjust commands for a specific reader. I thus moved this
method call to Unireader:init() method.

crereader.lua

@@ -7,6 +7,7 @@ CREReader = UniReader:new{
 }
 
 function CREReader:init()
+	self:addAllCommands()
 	self:adjustCreReaderCommands()
 end
 

reader.lua

@@ -50,7 +50,6 @@ function openFile(filename)
 		local ok, err = reader:open(filename)
 		if ok then
 			reader:loadSettings(filename)
-			page_num = reader.settings:readSetting("last_page") or 1
 			page_num = reader:getLastPageOrPos()
 			reader:goto(tonumber(page_num))
 			reader_settings:savesetting("lastfile", filename)

unireader.lua

@@ -101,6 +101,8 @@ end
 -- overwrite other methods if needed.
 ----------------------------------------------------
 function UniReader:init()
+	-- initialize commands
+	self:addAllCommands()
 end
 
 -- open a file and its settings store
@@ -133,8 +135,6 @@ function UniReader:initGlobalSettings(settings)
 	if pan_overlap_vertical then
 		self.pan_overlap_vertical = pan_overlap_vertical
 	end
-	-- initialize commands
-	self:addAllCommands()
 
 	local cache_max_memsize = settings:readSetting("cache_max_memsize")
 	if cache_max_memsize then