Fix #10701 & 10838
uncaught exceptions are written to stderr
same for unittest assert errors
regression test for Issue 10701

- The test isn't 100% reliable because it depends
  on the GC and array append cache state.
GC: Remove redundant locking in reallocNoSync.
Merge pull request #1 from dawgfoto/fix10701

regression test for Issue 10701
Merge pull request #650 from dawgfoto/stderrStacktrace

stacktraces need to be written to stderr
fix Issue 3454 - inconsistent flag setting in GC.realloc()
GC: Add assertions for B_FREE enum order assumption.
regression test for Issue 3454
Merge pull request #642 from Safety0ff/gcismarkedfix

Fix #10701 & 10838
add missing files to MANIFEST
fix mak/MANIFEST for master
Merge pull request #652 from WalterBright/fix-manifest

add missing files to MANIFEST
initialize variable locally

- goto will jump over the whole scope
Merge pull request #645 from Safety0ff/fix3454

fix Issue 3454 - inconsistent flag setting in GC.realloc()