Version 3.5.13
Added basic keyboard navigation of Index page. (Arrow keys, Page Up/Down, etc.)
System_Setup(): made $DOC_ROOT_OS global.
Put tabindex=-1 on main OneFileCMS logo.
Create_Table_for_Listing(): added "../" to top of directory listing.
Edit_Page_buttons_top(): [View Raw] on shows if text_editable.
Edit_Page_scripts(): check if [View Raw] exists...
  Also removed some old leftover test code...
Renamed Index_Page_onclicks() to Index_Page_event().
Added document.onkeydown function for basic keyboard nav of directory list.
Assemble_Insert_row()): added id's to move/copy/delete options as part of
  arrow key navivation of directory listing.
Build_Directory(): Same to <a> for filename.
On file change, stopped changing <textarea> border color to red.
Some css tweakin' & cleanup