[VIM] Add key-binding for relative line number.

Signed-off-by: Wei-Chung Wen <wei-chung.wen@mail.foxconn.com>
[VIM] Update commands generating ctags and cscopes indexes.

Also enabled key-bindings for cscopes.

Signed-off-by: Wei-Chung Wen <wei-chung.wen@mail.foxconn.com>
[Bash] New aliase "grepr" for recursively grep-ing.

Signed-off-by: Wei-Chung Wen <wei-chung.wen@mail.foxconn.com>