gvle: fix the tuple editor dialog

(closes #184)
gvle2: add the new GUI
gvle2: toward a file system enabling plugs
gvle2: enhance the display plugin system

The display plugin chooser has been enhanced. The check box connected
to the loaded plugins a better maner.
gvle2: add the WP2
 = Task 2.1 - Fix port connect into coupled models
  - Fix in/out port to submodel
  - Add basic connection highlight
 = Task 2.1 - Fix context menu bug
  - Menu can cause a segault when port not connected (read of an empty list). Fixed
 = Task 1.1 - Migrate help support to QTHelp framework
  - Add a custom rendering widget for -text only- pages (HelpBrowser)
  - Copy help pages to standard html source
  - Add QTHelp project and collection
  - Add a basic Makefile script to rebuild help
gvle2: add pkgconfig configuration
gvle2 : add a build menu item
gvle2: fix the installer
gvle2: improve the installer for gvle2
gvle2: improve the installer for gvle2
gvle2: improve the installer

a qt.conf file is generated.
gvle2: add the New Project menu item
gvle2: fix SegFault while opening empty.vpz
gvle2: add the install process

When launching the build process, the install process is launched
also.
Merge remote-tracking branch 'upstream/withgvle2' into withgvle2

Conflicts:
	CMakeCPack.cmake
	CMakeLists.txt
	src/vle/gvle2/CMakeLists.txt
	src/vle/gvle2/gvle2win.cpp
	src/vle/gvle2/gvle2win.h
	src/vle/gvle2/gvle2win.ui
	src/vle/gvle2/logger.cpp
	src/vle/gvle2/vlevpz.cpp