Add Histogram and ColorCube plugins
Addition of the bold, italic and background option in the Text plugins.
Bold and Italic fonction are modified / Utilisation of FontConfig
Add comment for the help menu.
Adding of the list of font families.
Blur: remove wrong assert
tuttleHost: graph allows multiple connections between 2 nodes

fix #171
tuttleHost tests: TimeShift offset meaning has changed

* offset direction has changed
* IsIdentity nodes are now correctly removed from the computation, so we can test that.
"forceIdentityNodesCompute" is no more mandatory.
tuttleHost: fix asynchronous access to options
ofxs: minor, clean indentation
tuttleHost test: Edges for tests should have a function "getInAttrName"
tuttleHost test: minor fix
oiio: check if file exists in getClipPreferences
FFMpegWriter: correct update pixel format if codec have not prefered pixel format
fix #172
Fundamental change of the font selection.
3rdParty: use boost 1.53 by default

boost atomic is now included
tuttleHost: throw BadIndex instead of assert on multidim parameters
tuttleHost test: add tests on Double param and add more check for error cases
sam-do: minor, remove const
oiio test: remove dpx writer which doesn't work