Latest release - v4.1

Update release of Incompact3D V4.X family. Main additions are:

• New pipe flow ready-to-run simulation
• Bug corrections
• 2D capabilities (i.e. nz = 1) with a 2D circular cylinder example
• New input files for various flow configurations
• First attempt at CMake build

v4.0: Merge pull request #85 from pbartholomew08/fix/force-in-forces-module

Move force subroutine into forces module