Properly support gcc 4.7 in C++11 (no thread_local yet)
Use thread safe alternative to thread_local.

This is doable now that all use of thread_local (on objects) is for function static.
fix copy/paste typo
Add (seemingly necessary on some older platform) explicitly instantiation
Replace the global in ZTrees.h by thread local state (initialiation is costly)
When using the builtin zlib we need to public some of the headers.

For example TPDF.cxx on Windows uses zlib.h
Avoid shadow variable/struct name
libCore now depends on pthread on some platforms
Correct which directory to add to -I (src rather than inc)
Correct which directory to add to -I (src rather than inc)
Fix 'typo' (zconf rather than Tailor)
To use the R__* macro, we need RConfig.h
The filter to avoid using __thread in ios was avoid preventing its use with 32bits build
Avoid doing a 2nd #define of the same thing
white space
applying patch from Paul Seyfert correcting copy-paste errrors in messages
There are still header files in core/zip/inc that need to be found while compiling tests in the build area.
Add missing lock
Add fit information on observed data in detailed output
Fix for ROOT-6496 and ROOT-6219