remove system rm call, change log file name format to PABLO[date].log
add getGlobal() to both 2D and 3D
add log class, add log file name to paratree constructor, exclude
ioFunct (to be eliminated after merge)
remove logFunct.hpp inclusions
Bug fixing in findnodeneigh
Doxygen Documentation included
INSTALL.md updated
MAPPING in Doxyfile and gitignore updated
doxyfile for doxygen 1.8.8
Merge branch 'master' of https://github.com/optimad/PABLO.git
add debug flag in compiling
delete doxyfile bak
INSTALL.md updated
Add files "utils.hpp" and "utils.cpp"

The files "utils.hpp" and "utils.cpp" could be useful to add new
utility's functions.
modify file "Class_Para_Tree.hpp"

The file "Class_Para_Tree.hpp" now includes "utils.hpp".
Modify file "Class_Para_Tree_2D.tpp"

The file "Class_Para_Tree_2D.tpp" now checks the existence of file
"PABLO.log" before removing it.
Modify file "Class_Para_Tree_3D.tpp"

    The file "Class_Para_Tree_3D.tpp" now checks the existence of file
    "PABLO.log" before removing it.
Move file "utils.cpp"

The file "utils.cpp" is now n directory "lib" instead of "include".
Modify file "logFunct.cpp"

The file "logFunct.cpp" now has no more x permissions.
Modify file "logFunct.hpp"

The file "logFunct.hpp" now has no more x permissions.