[Halld-offline] GEANT3 particle IDs

[David Lawrence]

Hi Offliners,

  I was just trying to add Pb208 to the list of particles defined in
particleType.h and ran into an issue. Several particle types have
been added that extend beyond the original GEANT3 particle ID
values (which is good). However, when I looked up the GEANT3
list at the link below, I see there are a number of other particles
defined, some of which conflict with the new ones added to
particleType.h. For example, all of the KStar particles with id
values 65-68 conflict with B10, B11, C12, and N14 in the
GEANT list.

http://wwwasdoc.web.cern.ch/wwwasdoc/geant/node72.html

Since we don't currently define any of the heavier elements,
this doesn't present a conflict at the moment. However, it might
be nice not to have this discrepancy between what we define
for these values and what the web documentation says. Since all
code should work off of the enum and NOT have any of these
hard-coded, then changing the values in particleType for
should not affect anything.

In a nutshell, I'd like to:

- Change the currently defined particle IDs in particleType.h
    that have values of 65 or greater to be 100 greater than
    they are now (e.g. KStar_892_0 will change from being
    65 to being 165, ...)

- All other values will stay as they are since they are already
    in alignment with the GEANT documentation

This potentially could affect anyone processing files that
have these particles defined with the old numbers if
they try reading them with new code.

It could also break anyone's code that uses hard-coded
numbers for these (in which case I would feel really,
really bad ... OK not really. If that happens you kind of
deserve what you get).

Sorry for the long winded explanation, but I wanted to give
everyone a chance to object before I checked in this change.

-David