add .git/tags to tags search path

vimrc

@@ -6,7 +6,9 @@ set timeoutlen=250             " Time to wait after ESC (default causes an annoy
 set clipboard+=unnamed         " Yanks go on clipboard instead.
 set pastetoggle=<F10>          " toggle between paste and normal: for 'safer' pasting from keyboard
 set shiftround                 " round indent to multiple of 'shiftwidth'
-set tags=./tags;$HOME          " walk directory tree upto $HOME looking for tags
+set tags=./tags                " walk directory tree upto $HOME looking for tags
+set tags+=./git/
+set tags+=$HOME/
 
 set modeline
 set modelines=5                " default numbers of lines to read for modeline instructions