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.

git-svn-id: http://root.cern.ch/svn/root/trunk@23295 27541ba8-7e3a-0410-8455-c3a389f83636

The background is the following. While working on the PROOF code I found
that enumerating TList is an inconvenient and a long operation, I had to
write the same code all over the place and make duplications. I tried
to use STD algorithms with it, namely std::for_each, and failed.
I therefore decided to enable std::for_each algorithm for ROOT 
Containers/Iterators by making as few as possible changes, without rewriting
iterators at all. Now with only two simple lines of code one is able to
iterate through a container:

TIter iter(&list);
for_each(iter.Begin(), TIter::End(), SEnumFunctor());

or

for_each(iter.Begin(), inter_end, SEnumFunctor());

where iter_end could be an iterator to a middle of the container.

After I had changed Iterators so that they could be used with std::for_each,
I decided to go further and did some more changes. As a result,

  - I have updated CINT implementation of some algorithms (they look now
    more or less better in terms of the standard),

  - TList and TObjArray can be now used with std::for_each, std::find_if,
    std::count_if (probably with some more algorithms. I've listed here
    only what has been *checked* by me). Other containers will be supported
    in a next patch.

  - A test program has been added: $ROOTSYS/test/stressIterators.cxx

  - A tutorial macro has been added: $ROOTSYS/tutorials/cont/TListAndSTL.C

Patch has been verified on Linux, MacOS X, Solaris 10 i386 and Windows.


git-svn-id: http://root.cern.ch/svn/root/trunk@23198 27541ba8-7e3a-0410-8455-c3a389f83636