Alien user documentation

• Building and Using Alien
  • Building Alien
    • Getting the sources
    • Configuring
    • Example
  • Using Alien from a CMake project
• Alien’s high level design
  • Mathematical Choices
    • Linear Algebra
    • Spaces
  • Software design
    • Multiple representations
    • Stateless objects
    • Coherent APIs
  • References
• Building with move semantic
  • DirectMatrixBuilder
  • ProfiledMatrixBuilder
  • MatrixData
  • IMatrix
• Building with ref semantic
  • DirectMatrixBuilder
  • ProfiledMatrixBuilder
  • StreamMatrixBuilder
  • Matrix
  • IMatrix
  • Vector
  • IVector