GH# 545: use short for sign
#538 fixed ParallelSocketReactor dtor
#538 more dtor fixes and some style fixes along the way
changed exception text
Merge branch 'develop' of https://github.com/pocoproject/poco into develop
upgraded SQLite to 3.8.6
- don't throw if SSL client unexpectedly closes connection as this seems to be the normal behavior of web browsers (seen with Chrome and IE)
sqlite 3.8.6