Small cleanups.

Removes now empty initializeBoundaryConditions.

 - initializeNeumannBcs() is no longer needed.
 - make _neumann_bcs a vector of unique_ptr's.

Fixes for Windows cross-compilation

Test for GeoMapper

Binary package of Qt from http://pkg.mxe.cc is linked against SSL.

Removed one unused tag from the input files of PETSc examples

[MeL/MeshSearch] MeshElementGrid

make ConfigTreeNew more robust against nullptr accesses

added check for normalising 0-vector

Remove some doxygen warnings

The access now must be done through some non-member functions.

Update create boundary conditions along polylines