PKGBUILD: add PM-related service packages

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
zsh: some fixes in zshrc

1. set complete cache directory to $HOME/.zcache instead of local
directory .zcache
2. use ${COLUMNS} instead of ${COLUMNS} - 1 to be TERMWIDTH, though
don't know why the original version use "-1".

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>