Merged requested to merge feature/bessel into master
This MR introduces Womersley boundary conditions for pulsatile flow in straight pipes. To provide the appropriate boundary conditions a file specified in the USERDEFINED BC string is appended with a colon and then a filename, i.e. where the filename WomParams.xml contains the setup details. Ideally we would like a better solution than using the colon extension and an issue has been raised on this.