Finish implementation of externalcom for Windows IPC.

First version of the Windows ExternalCom implementation.

Make the building of D-Bus support optional.

Prevent reopening an already open file.

Add "multi-instance" and "new-session" command line options.

Complete implementation of inter-instance loading using D-Bus.

Refactor the dbus module to use a special object for registration.

Complete DBus external com and quit when another instance is open.

First implementation of external com via D-Bus.

Add proto for external com interface.

Fix build with Qt4.

Defend against allocation errors whilst indexing.

Improve the release/debug build system.

Don't disable the tab bar during loading (not necessary).

Fix the reload and stop buttons with multiple files.

Automatically hides the tab bar when there is only one tab.

Correctly clear info line and QFM when last tab is closed.

Tweaks the visual aspect of the tabs on Windows.

Change the API for Persistable to use shared pointers.

Fixes memory leaks identified by Valgrind.

Fix build scripts.

Handle trying to open a non-existing file.

Crawler doesn't sent "loadFinished" until it is.. finished!

Displays the right file name in title and status.

Have the CrawlerWidget send all state signal when activated.