COMP: Cppcheck for SyncRecord.
PERF: AtlasSummation m_MeanBuilder in initialization list.

Suggested by cppcheck.
STYLE: Reduce writeOutputImage scope in ImageCompareCommand.

Detected by Cppcheck.
BUG: Remove SyncRecord debug printing.

Distracting in code that uses it to be on by default.
Merge pull request #178 from thewtex/cppcheck

Cppcheck warnings
Merge pull request #179 from thewtex/syncrecord-coughing

BUG: Remove SyncRecord debug printing.