seg.c: SegDescribe: say "buffer: NULL" if it is (rather than saying nothing).
buffer.c: BufferDescribe: now interprets buffer->mode for you.
poolamc.c: amcSegCheck: check Nailboard present onlyif SegNailed for some trace;
AMCSegDescribe: correct SEG_SUPERCLASS (so we see GCSeg fields);
say whether seg is Mobile, Boarded (there's a nailboard), or Stuck;
clearer Map symbols, and print a key for them.
Copied from Perforce
Change: 161983
ServerID: perforce.ravenbrook.com
all segs: say "buffer: NULL" if it is (rather than saying nothing)
AMC: correct SEG_SUPERCLASS, so we see GCSeg fields, and say if there's a nailboard.
Copied from Perforce
Change: 161973
ServerID: perforce.ravenbrook.com
Making some new files consistent with changes from that branch.
Deleting some new Global Graphics confidential files.
Copied from Perforce
Change: 30256
ServerID: perforce.ravenbrook.com
This change will be integrated but ignored (-ay) to the gg-epcore/union sources, so that they retain HopeNames.
Copied from Perforce
Change: 24911
ServerID: perforce.ravenbrook.com
This was achieved by partially undoing changelist 24817, including an accidental corruption of eventgen.pl.
Copied from Perforce
Change: 24877
ServerID: perforce.ravenbrook.com
