Update to clang-format-5 and reformat the codebase 

BinaryOperation::checkSizeCompatiblity and overridden versions in child
classes have been changed to return std::string rather than bool so that a
useful error message can be passed back down the call stack before finally
being used in throwing std::invalid_argument in BinaryOperation::checkCompatibility.
A return of true is now a return of "" (empty string). A return of false is
now a string of length 1 or more containing an error about why the
algorithm couldn't complete. Functions that used the bool return before
have been changed to use checkSizeCompatiblity(lhs,rhs).empty as that is
the equivelent of the old boolean return.
Removed a load of commented-out code from Multiply.cpp.
Indented WeightedMean.cpp and WeightedMean.h as per the guidelines.

Refs #4489

 Fixes #2277: A million tests for every possible permutation of multiply and divide workspace. Whew!

Ensure that single valued workspaces can be used in binary operations regardless of whether they are lhs or rhs. There was a small bug with multiply that meant they would fail on the lhs. Also ensured that the Python binary overloads provide better information if they fail. Re #2215

Rename Framework code directory to just that. Also delete Main and VS & Eclipse project file. Re #1881.

Add propagation of masking to BinaryOperation. Also some tidying up while I was there that spidered a small amount. Re #632.

Remove redundant loggers from Algorithms project

Add the first version of a UnaryOperation base algorithm class, along with a sample algorithm to correct a workspace according to a polynomial function of the X values. Re #520.

re #351. A change to the workspace hierarchy. What used to be Workspace is now called MatrixWorkspace. New Workspace is a base class for MatrixWorkspace and TableWorkspace. TableWorkspace can be stored in AnalysisDataService and passed to algorithms as a property.

SimpleIntegration modified so that it outputs a Workspace2D with an X dimension of 1 instead of a Workspace1D. This means that spectra numbers can still be attached to the values. Also removed some unnecessary references to Workspace1D elsewhere. Re #107.

Refs #123. Some of the changes reverted.  We need to keep Algorithm a little header heavy to keep the implementation of new algorithms as easy as possible

Rename tripleiterator to WorkspaceIterator

missed adding a file