unique switch of aboutus

Conflicts:
	aboutus.php
rewrite aboutus

Conflicts:
	aboutus.php
rewrite aboutus with layer link and had left_cate_list

Conflicts:
	aboutus.php
assign global tag_main_func using au_subject when it's not in seo mode

Conflicts:
	aboutus.php
layer_link in aboutus using ws_array[main]
change process of invoke header_footer in aboutus

Conflicts:
	aboutus.php
show baselink of current func in aboutus if au_cate is not aboutus
indent in aboutus
assign tag_main_func  in aboutus list using au_subject instead of [ABOUT_US]
rewrite aboutus for add new get_link of aboutus and generate non-seo link as turn on au_cate

Conflicts:
	aboutus.php
global  in get_link of aboutus
modification on aboutus from cometech

Conflicts:
	aboutus.php
modification on aboutus for assign tag_main_func correctly
若有設定au_cate，則後台aboutus就顯示類別
後台更新aboutus.php也要quote
後台aboutus進一步微調
關於我們獨立類別選項
調整aboutus::left_cate_list出現的地方
取消一般左選單的輸出語法
更新aboutus頁首的副檔名