zsh completion: add deptest and database

Signed-off-by: Daniel Wallace <danielwallace@gtmanfred.com>
zsh completion: fix stacked completion

Before this, if you do pacman -Sy<tab> it completes to -y.  Now, with -S
and the other operations in the actual option _arguments, it won't
remove the operations.

Signed-off-by: Daniel Wallace <danielwallace@gtmanfred.com>
zsh completion: use consistent case statement style
Signed-off-by: Daniel Wallace <danielwallace@gtmanfred.com>
zsh completion: make sure all indentions are tabs

Signed-off-by: Daniel Wallace <danielwallace@gtmanfred.com>