[Halld-offline] [EXTERNAL] bug fix to XString class in hdds

[Richard Jones]

Hello,

I have diagnosed and fixed a bug in the XString class that is used for
parsing the hdds geometry. It mainly pertains to users of hdgeant and
hdgeant4. I came across this bug trying to build our simulation with a more
recent version of the compiler, and it segfaulted. I am not sure why it
never showed this behavior before, maybe the way the compiler implements it
has changed? Anyway, this fix needs to be applied to the master branch and
people's simulation codes updated before doing any further development work
on the sims. The PR for this fix to the master branch is pending on
JeffersonLab/hdds, together with another fix to the flat-files geometry. If
someone could act on those, it would be great.

-Richard Jones
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