Feature
#262 #265 Separate the goroutine creating symbolic links and installing packages to create all symbolic links before installing packages.
It takes a long time to install many packages. Even if the installation is canceled, all symbolic links would be created so you can execute the packages. In that case, packages would be installed by the Lazy Install.
Document
#221 #264 Add How to clean unused packages
#263 Add How to uninstall aqua
#256 Update USAGE
#257 Update the Configuration Document