zziplib: fix description (don't repeat package name)
zynaddsubfx: fix description (capitalize first word)
zsh: improve description

Capitalize first word. Wrap overlong longDescription line.
zoom: add meta attributes

And do some coding style / whitespace clean up.
zlib: add description and license info
zip: add meta.description
zile: fix description (don't repeat package name)
zeitgeist: fix description (don't repeat package name)