Whitespace changes by clang-format.

These files are the ones with the least number of changes when running
clang-format over them and only the less controversial changes are
included, with a preference for having stay the same where things are
likely to be more controversial.
I now prefer a single space between arguments (if there are any) and surrounding braces and following an argument separator ','  . What is the group wisdom/opinion/decision on this?