ENG-4870: Don't terminate ack tracking thread if the thread was interrupted.
Merge pull request #605 from VoltDB/ENG-4870-stream

ENG-4870: Don't terminate ack tracking thread if the thread was interrupted
Add PDFs of undated documentation to s/w kit.
Merge branch 'boost153' into ENG-4696-truncate
Reworking two lines of code to fix bad union problem on CentOS 5.
Probably a GCC compiler/optimizizer bug?
Hopefully this works...
Merge branch 'boost153' into ENG-4696-truncate
Merge branch 'ENG-4696-truncate' into ENG-extract
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-4696-truncate
Merge branch 'ENG-4696-truncate' into ENG-extract
Make it more readable, adding a variable