see #75

that interface does not exist in recent versions of LHCb

Closes #56

- improvements to build options for LCG96
- bug fixes for a few sanitizer found issues
- preliminary clang support for sanitizers

* fixes a (correct!) gcc9 warning about deprecated implicit assignment
  operator -- in general, either both copy constructor and assignment
  should be defined, or neither

In case no new file name was set, e.g. by not calling `io_update_all`,
do not try to open a file with an empty file name. This is a common
use-case in case the mother process is continuing to use its initial set
of ROOT files.

Gitlab CI authored 5 years ago and Christopher Rob Jones committed 5 years ago

patch generated by https://gitlab.cern.ch/jonrob/Gaudi/-/jobs/5192816

* do not explicitly specify details:: when it is not needed
* change a 'zip::const_range' into a 'zip::range' as the content
  is already const (and this avoids an internal compiler error
  downstream)
* define two macros to factor out the pragmas needed to exclude
  a false positive clang diagnostic, and update the existing
  exclusion to use these.
  Note that current clang trunk is fixed, see https://bugs.llvm.org/show_bug.cgi?id=42104,
  so starting with clang 9, the diagnostic should no longer
  have the false positive.

`TDirectory::mkdir` returns a `nullptr` in case the directory already
exists. This can happen in case the destination ROOT file already
exists.

- Update Gaudi version to v32r1 and LCG to 96
- Update change log