Add the archive name column in the list-packages table

[Darren Hoo]

Hi guys,

For those who use third-party archives other than GNU elpa it is not
easy to tell where a package is from without bringing up the summary
info of a package. And it is even worse for those who use more than two
archive locations as packages listed are mingled together(no sorting).   

So How about adding a column in list-packages that specifies the archive
name where one package is from?