Add doc browser to corpus list.
Remove decprecated addListener method for the corpus info button.
Add a doc browser table tab sheet.
Add the basic classes for doc browser.
Refactor ResolverProvider. This interface is moved to annis-libgui and the
implementation is seperated from ResultPanel.
Doc Browsing works in very basic way. Things left todo:

- make doc browsing configurable
- make use of nice icons instead of labeled buttons
- windows should open only ones.
Open doc visualizer in extra tab.
Cache doc visualizers.
Cache the doc browser table.
Refactor visualizer caching for doc browser.
Add new document icon.
add icon for visualizer browser
Add a new extra metadata window for the doc browser.
Use nice icons in the title of the tabs of the docbrowser.
Read the default config.
Add the doc-browser config to the default corpus properties.
Change the default seg to tok for doc browser visualizer.
Really build a canonical title for doc visualizer.
Read the namespace and mappings from the doc visualizer config.
Change title of doc viusalizer.