Make ROOT v6-26-04 with ALICE patch on top

Optional power-user treatment to reduce syscalls during startup

This commit provides the possibility to pass system library search
paths as well as some compiler include paths to ROOT as environment
variables.
This has the advantage that ROOT will not spawn sub-processes
and we can do the setup only once, instead of doing it for every
single executable that is linked to ROOT.

v6-24-06-patches-alice1

Optional power-user treatment to reduce syscalls during startup

This commit provides the possibility to pass system library search
paths as well as some compiler include paths to ROOT as environment
variables.
This has the advantage that ROOT will not spawn sub-processes
and we can do the setup only once, instead of doing it for every
single executable that is linked to ROOT.

v6-20-02-alice9

Make GetEntriesSerialized actually work with destructive serialization

TBulkRead::GetEntriesSerialized should simply work with destructive
serialization. Not sure why the check is there.

v6-20-02-alice8

TBranch::GetBulkEntries proper handling of already loaded basket

This fixes Issue #6416 and Issue #6417

v6-20-02-alice6

Invert opt noGlobalUsingStd(def=false) to globalUsingStd(def=false)

With this patch the rootcling option noGlobalUsingStd (by default off) preventing declaration of
{using namespace std} in the global scope is inverted to option globalUsingStd(def=false) which allow
to declare using std. Therefore, by default the pollution of the global scope will be forbidden but
optionally can be requested.

v6-20-02-alice5

Avoid {using namespace std} in global scope of dictionary [ROOT-10661]

In order to avoid {namespace std} interfering with following include files,
when generating a dictionary file add the {using namespace std;} only after
GenerateNecessaryIncludes method is called.

Since many legacy root header files do require this global {using namespace std;}
to complete the tests, old behaviour is kept by default and the global
{using namespace std} can be avoided by adding -noGlobalUsingStd to rootcling invocation.

Allow passing ACLiC RootCling flags via .rootrc (Vassil)

This is a special patch tailored for v6-20-02

v6-20-02-alice4

Fix tests arrow tests

v6-20-02-alice2

Read size of archive member when accessing directly