Properly manage repeated identical properties
Remove propagation of info in version tag
Implement ioread rules in the selection XML

Two steps here:
1) be able to parse selection files like
 <ioread sourceClass="class1" targetClass="class2" version="[1-]" source="" target="transient_">
 <![CDATA[
        newObj->initializeTransients();
 ]]>
 </ioread>
This is done in the XML reader: the key is tellg and seekg

2) Let the info flow into the dictionary
This is done creating a string which is a linkdef pragma. Then the
function ROOT::ProcessReadPragma provides the parsing and the
storing of the info in the ROOT::gReadRules variable, which is
read within TMetaUtils::WriteClassInit to translate in code the
rules.
Fix case when ]]> and other tags are on the same line
Maximum flexibility for the code for schema evo rules in xml files
Fix http://root.cern.ch/phpBB3/viewtopic.php?f=3&t=17062&hilit=unzoom
When an UnZoom was performed on the Y-Axis any plot but an histogram,
the label axis size was reset.
New example demonstrating the canvas partitioning.
Instead of removing the FileEntry 'just' invalidate its cache.

When there is an error introduced by #include-ing a file we should be able to
hit the disk (in cling's context) the next time. The user could fix it in the
meanwhile.

Newer clang supports a flag which can be used to mark the user files as volatile.
This means that the file stat will be invalidated, causing clang to hit the
disk and fetch the new content of the FileEntry.

The complication comes from the fact that when the file size of the file entry
is invalidated the cache in the SourceManager is not syncronized, thus clang
issued an error. The patch in clang checks if the file size == 0 and the
modification time == 0 this means that we are in cling's context and have to sync
the cache and continue with no errors.

This fixes an issue exposed by Jerome's implementation. Before we removed the
entire FileEntry to achieve the same behavior, however the SourceManager kept
the reference to it. This leads to seg faults when iterating over the included
files (eg. .files or .storeState)
Move the implementation in an interpreter-independent object.

We don't need the intepreter to store clang's state. We can use a separate object
for that which allows to be reused.

Provide *much* shorter and cleaner implementation.
No need of cleanup in the testsuite - we use temporary uniquely named files.
Remove commented out code.
Publish the useful helper class.
Update references to the file.
We don't need to keep track of the .L-ed files.
The implementation of TCling is very raw and I bet we can improve it a lot.
Now the libraries and the #included files are not in the same place.
Reset the cache only if there is a fileentry associated with it.

This avoids removing the cache of the virual file, wrapping the memory buffers
in cling.
Temporary fix to the build. This will be factored out by our future DynamicLibraryManager.
Reduced debug output
Merge remote-tracking branch 'origin/master' into CMSFixes
Style.