* Set width only for the closest component instead of the whole window.
* Increase rows height of packages_treeview from 20 to 22 so that we can
see the tails of the 'j's and 'g's (there must be a better way than forcing
the height, but I didn't find it).
* Increase a little the columns width, based on the average text
displayed in them.
* Set 'Name' column expandable, meaning that when you resize the window,
it will be this column that will take the width difference, which is
probably what the users want to do 95% of the time.
* Set the window expandable. This doesn't change anything, but offers a
better display in Glade.
