Change tutorials group names XXX to tutorial_XXX to avoid clashes with the classes' group names in the Ref Guide, in view of merging Ref Guide and tutorials' doxygen build.

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   Change char array's name (which was "17") to "fore"


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  Mods which allow to run this script by clicking with a ROOT browser,
  i.e. in gui mode (add switching back to GUI mode at the end of script).


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  This tutorial new demonstrates:
  - how to directly access and manipulate ARGB pixel values of an image.
  - how to make a part of an image to be transparent.
  - how to merge/alphablend an image with transparent colors
    with some background image.


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-fft:      Fast Fourier Transform with the fftw package
-fit:      Several examples illustrating minimization/fitting
-foam:     Random generator in multi-dimensional space
-geom:     Examples of use of the geometry package (TGeo classes)
-gl:       Visualisation with OpenGL
-graphics: Basic graphics
-graphs:   Use of TGraph, TGraphErrors, etc
-gui:      Scripts to create Graphics User Interface
-hist:     Histograming
-image:    Image Processing
-io:       Input/Output
-math:     Maths and Statistics functions
-matrix:   Matrices (TMatrix) examples
-mlp:      Neural networks with TMultiLayerPerceptron
-net:      Network classes (client/server examples)
-physics:  LorentzVectors, phase space
-pyroot:   python tutorials
-pythia:   Example with pythia6
-quadp:    Quadratic Programming
-ruby:     ruby tutorials
-smatrix:  Matrices with a templated package
-spectrum: Peak finder, background, deconvolutions
-splot:    Example of the TSplot class (signal/background estimator)
-sql:      Interfaces to SQL (mysql, oracle, etc)
-thread:   Using Threads
-tmva:     Examples of the MultiVariate Analysis classes
-tree:     Creating Trees, Playing with Trees
-unuran:   Interface with the unuram random generator library
-xml:      Writing/Reading xml files


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