updates in packages
update the location of ac
highlight current line, gdb, auto-complete-clang, the shortkey of
helm-for-files from C-x C-a to C-x C-p since C-x C-a is a prefix
shortkey, M-x gbd won't work
update the location of ac
get rid of small straight arrow in the fringe if the line is too long by
default by setting truncate-lines