Add different toolbars to window ui file.

I have substituted the windows headerbar for a notebook
with different headerbars. The second header bar is the preferences
pannel header bar.
In addition I have remove the view button at edit toolbar. This
closes #9 issue.
Add new preferences panel.

I have taken preferences dialog ui and I put
that inside a stack. The new panel has no behaviour.
Move AutoConf output to the end of configure.ac file.