mps br/vmem: simple-chunk-return:

arenavm.c --  on VMFree(), destroy any empty chunks (except the primary).  (VMFree is not the ideal place to do it, but works for proof of concept).
 tract.c -- fix ChunkCache defects:
  - previously, if cache is empty (chunkCache->chunk == NULL) then other fields are *undefined*; but code looks at them anyway (!) without first checking chunkCache->chunk;
  - change it (.chunk.empty.fields) so that, if cache is empty, other fields have defined values: cache-using code may look at them, and they are chosen so that no cache hit will occur.
  --> this fixes crashing defect shown by changelist 170072
  - AVERT(ChunkCache) in the many places it should be checked;
  - use AVERT_CRITICAL in ChunkEncache, because it is called by ChunkOfAddr;

 Also:
 plan.txt -- notes on use of primary chunk.
 config.h -- DIAG also in ci, please [Do not integ to master]
 diag.c -- skip ChainCondemnAuto diag thanks
 zcoll.c -- move printf announcing Destroying arena etc to just before, not just after, we do it.

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 Change: 170082
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