Simon Bürger

add an (optional) preconditioner to CG. I have implemented as part of the existing cg class instead of a new class to reduce code-duplication. Running CG on a matrix `M`...

some small groundwork for Langevin/HMC

3

This PR contains some small additions I needed to make make my Langevin code run. My Langevin(/HMC) code itself is by far not general enough to put it into gpt,...

The function ``` void foo(LatticeColourMatrix& field) { ColourMatrix avg = sum(field) * (1.0 / field._grid->gSites()); field = field - avg; } ``` does not compile due to an ambigous overload...

add option to pass --fallback-style to clang-format

1

The '--fallback-style' option can be used to tell clang-format what to do in case '--style=File' is specified, but no '.clang-format' file is found. This closes #70