Shorter array notation + documentation update

[fidian]

Old:

if [[ "${#arrayName[@]}" -gt 0 ]]; then
    local "$target" && wickIndirectArray "$target" "${arrayName[@]}"

    return 0
fi

local "$target" && wickIndirectArray "$target"

New:

local "$target" && wickIndirectArray "$target" ${arrayName[@]+"${arrayName[@]}"}

Syntax works with:

• Empty arrays
• Arrays that contain values with spaces
• Arrays that contain empty values
• Arrays with normal, boring values