Clean up member admin management

src/Fetcher.js

src/Head.js

src/MemberAdder.js

src/MemberList.js

src/Panel.js

src/ProductList.js

src/Topup.js

src/member/MemberAdder.js

src/member/MemberEditer.js

src/member/MemberForm.js

src/member/MemberList.js

src/member/MemberPicker.js

src/purchase/Purchase.js

src/util.js