update cscope db from vim

First, you need to update cscope database.

:!cscope -Rbq

Then, reinit the database from vim.

:cs reset

Building on a previous answer, add this to your .vimrc:

map <F5> :!cscope -Rb<CR>:cs reset<CR><CR>                                      

Then use F5 within vim to do the refresh.

-b = Build cross-reference only. -R = Recurse subdirectories during search for source files.