Apply clang-format on some infrequently-updated files

Only touch files with at most 5 commits in the past 6 months (and excluding some recently created files).

Command line:
```
clang-format-3.6 -style=file -i allocators.cpp coincontrol.h checkqueue.h db.h hash.cpp limitedmap.h noui.cpp noui.h random.h sync.cpp threadsafety.h addrman.cpp allocators.h leveldbwrapper.h leveldbwrapper.cpp miner.h mruset.h protocol.h rpcclient.h sync.h chainparamsbase.h chainparamsbase.cpp random.cpp timedata.h uint256.cpp version.cpp base58.cpp checkpoints.h clientversion.h db.cpp init.h key.h
```