Add submodules files of sync and upgrade
	new file:   cmds/submod_sync.sh
	new file:   cmds/submod_upgrade.sh
Reconstruct the folder structure
	new file:   env/.screenrc
	deleted:    installVim.sh
	new file:   install_vim.sh
	new file:   vim/.vimrc
various update
add the .gitmodules
Add the utils of env: zsh and screen
	new file:   env/.zshrc
	modified:   install_env.sh
	modified:   install_vim.sh