fix for looping over builtin arrays in a tree
Undefine GSL_SUCCESS after the import of ldap.h

this is done in order not to encounter problems with the GSL_SUCCESS
variable defined in the Gnu Scientific Library.
Fix for ROOT-5881

Rootcling does not generate the dictionary for std string if it
is not invoked within the ROOT build process.
Return eta=0 for  a (0,0,0) vector. Also do not print warning in this case.
See http://root.cern.ch/phpBB3/viewtopic.php?f=3&t=17484
TPad::Print() really works on TCanvas only. A protection has been added in case it is called on a pure TPad.
Re-implement (explicitly) handling of typedefs as nested name specs: TD::A.

This got lost in 2b6ae0aed / 96a4437c8 where typedefs were handled.
Simplify logic (and thus shorten code).
Fixes error in roottest/root/tree/addresses:
Error in <TStreamerInfo::Build>: Embedded_objects, unknown type: EmbeddedTypedef::Embedded3 m_emb4
TSplitType references name as char*; must not overwite it to store output.

Fixes a valgrind report on roottest/root/tree/addresses/embwrite.C:
==11288==    at 0x4E136D6: TClassEdit::TSplitType::ShortType(std::string&, int) (TClassEdit.cxx:281)
==11288==    by 0x833CA0E: R__DropDefaultArg(std::string&) (TClingCallFunc.cxx:110)