want to re-load Cscope database when open every file

[huaihuaiVV]

I want to reload the Cscope database when open every file ,
not just init it one time, add change like this :

+augroup autoload_cscope

• au!
• au BufEnter * call Cycle_csdb()
• au BufUnload * call Unload_csdb()
  +augroup END