this fix restores the previous behavior of dislotwin

very strange behavior in plasticity_detect changes for dislotwin. This
fix restores the old behavior with respect to number of iterations.
Using orientation%fromMatrix() results in much more iterations and an
increase in runtime for the test from approx 6 min to 40 min. Results
still match in the end. Also, crystallite_Fp0 differs by approx 1e-15
only between the two methods.
I assume that something is wrong with either dislotwin or the
state/stress integration

src/crystallite.f90

@@ -380,7 +380,7 @@ subroutine crystallite_init
   do e = FEsolving_execElem(1),FEsolving_execElem(2)
     myNcomponents = homogenization_Ngrains(material_homogenizationAt(e))
     do i = FEsolving_execIP(1,e), FEsolving_execIP(2,e); do c = 1, myNcomponents
-      crystallite_Fp0(1:3,1:3,c,i,e) = material_orientation0(c,i,e)%asMatrix()                      ! plastic def gradient reflects init orientation
+      crystallite_Fp0(1:3,1:3,c,i,e) = math_EulerToR(material_Eulers(1:3,c,i,e))                    ! plastic def gradient reflects init orientation
       crystallite_Fi0(1:3,1:3,c,i,e) = constitutive_initialFi(c,i,e)
       crystallite_F0(1:3,1:3,c,i,e)  = math_I3
       crystallite_localPlasticity(c,i,e) = phase_localPlasticity(material_phaseAt(c,e))

src/material.f90

@@ -169,6 +169,8 @@ module material
     microstructure_phase, &                                                                         !< phase IDs of each microstructure
     microstructure_texture                                                                          !< texture IDs of each microstructure
  
+  real(pReal),    dimension(:,:,:,:), allocatable, public,protected :: &
+    material_Eulers
   type(Rotation), dimension(:), allocatable, private :: &
     texture_orientation                                                                             !< Euler angles in material.config (possibly rotated for alignment)
   real(pReal), dimension(:,:), allocatable, private :: &
@@ -316,6 +318,7 @@ subroutine material_init
   allocate(material_phaseAt(homogenization_maxNgrains,discretization_nElem),                   source=0)
   allocate(material_texture(homogenization_maxNgrains,discretization_nIP,discretization_nElem),source=0)   !this is only needed by plasticity nonlocal
   allocate(material_orientation0(homogenization_maxNgrains,discretization_nIP,discretization_nElem))
+  allocate(material_Eulers(3,homogenization_maxNgrains,discretization_nIP,discretization_nElem))
 
   do e = 1, discretization_nElem
      do i = 1, discretization_nIP
@@ -324,6 +327,7 @@ subroutine material_init
          material_phaseAt(c,e)        = microstructure_phase(c,myMicro)
          material_texture(c,i,e)      = microstructure_texture(c,myMicro)
          material_orientation0(c,i,e) = texture_orientation(material_texture(c,i,e))
+         material_Eulers(1:3,c,i,e)   = texture_orientation(material_texture(c,i,e))%asEulers()
        enddo
      enddo
    enddo