If necessary it still could be accessed through TAuthenticate.

Error bar position was a bit more complex to compute than what was done in the previous fix for https://sft.its.cern.ch/jira/browse/ROOT-5468

Only set ROOTSYS/gRFootDir if building ROOT. But then always update ROOTSYS; other parts of ROOT depend on it.

Since it is now different from _R__UNIQUE_ and used explicit, we can define it
unconditionally and thus avoid the case (used by MakeProject) where the header
is parsed before R__DICTIONARY_FILENAME is declared (technically this means
that previously the dictionary generated by MakeProject _could_ have had
some naming clashes with similar dictionary since the _R__UNIQUE_ used was
the non-dictionary one).

_R__UNIQUE_ is used to give unique names of automatically generated entities. In
order to further disambiguate dictionary entities (as they can clash among other
dictionaries easier) we have introduced another version of _R__UNIQUE_ taking
the dictionary id into account.

Modules builds are unhappy with this because we have one version of _R__UNIQUE_
in the module file and another version when compiling the dictionary due to
expanding of R__DICTIONARY_FILENAME.

The fix simply renames the macro avoiding such a clash.

This broke our bots.

This reverts commit 32bb2815.

Improves readability and works around a subtle modules bug.

_R__UNIQUE_ is used to give unique names of automatically generated entities. In
order to further disambiguate dictionary entities (as they can clash among other
dictionaries easier) we have introduced another version of _R__UNIQUE_ taking
the dictionary id into account.

Modules builds are unhappy with this because we have one version of _R__UNIQUE_
in the module file and another version when compiling the dictionary due to
expanding of R__DICTIONARY_FILENAME.

The fix simply renames the macro avoiding such a clash.

- Use crispEdges for shape rendering

For some reason that was not visible before the change to the prompt diag suppression.

"png" or "svg" for the time being. "png" is the default value.

The fist error is due to the dangling pointer. "buffer" never gets to be allocated in the function GetUnzipBuffer.

The second error is deallocating the memory "ptr" point to. Therefore, fUnzipChunks[idxtounzip] becomes null pointer.

It should work now. To test the parallel unzipping, simply random generate events and read them.

    /PATH/TO/TEST/eventexe 1000 6 99 1 1000 (generate 1000 events with zlib)
    /PATH/TO/TEST/eventexe 1000 6 99 20 1000 (unzip and read 1000 events in sequential manner)
    /PATH/TO/TEST/eventexe 1000 6 99 21 1000 (unzip and read 1000 events in parallel)

This reverts commit 0b43fba4.
This change makes things worse; it needs a more intrusive / thorough fix,
setting gRootDir from rootcling when building ROOT.