Adding explicit template instantiation.
Moving some _impl.h files into implementation dir.

Adding simple template of project with Makefile to examples.
Adding cmake tests for PETSc for testing of solvers.

Finishing new template interface for GMRES.

so far).

Adding unit tests for tnlString, tnlObject and tnlArrayManager.

Adding new class tnlArrayManager for managing arrays - allocation/deallocation, load and save functions etc.
tnlVector is derived from tnlArrayManager.

Fixing timers.

Adding paralle reduction to SpMV in Rg CSR format.