added test for new <BXCSCL> option

tests/KKRhost/test_inputs/test_24_BXCSCL/inputcard

+================================================================================
+   * * *   G E O M E T R Y   * * *
+================================================================================
+ALATBASIS= 5.423       lattice constant (in a.u.)
+BRAVAIS                   (units of lattice constant)
+  1.0  0.0  0.0
+  0.0  1.0  0.0
+  0.0  0.0  1.0
+NAEZ= 2   (Number of sites in the unit cell)
+CARTESIAN= T
+<RBASIS>              <ZATOM>  <SHAPE>  <BXCSCL>
+ 0.0   0.0   0.0        26.      1       1.1
+ 0.5   0.5   0.5        26.      1       0.9
+
+================================================================================
+   * * *   A C C U R A C Y   * * *
+================================================================================
+NSPIN= 2      				(1/2 paramagnetic/spin polarized calc.)
+LMAX= 3       				(cutoff in the expansion:2 in OK, 3 good, 4 very good)
+INS= 1        				(0/1: asa/full-pot)
+KSHAPE= 2     				(0/2: asa/full-pot, needed for voronoi)
+RCLUSTZ=  2.00d0 			(parameters for the screening clusters)
+BZDIVIDE= 10  10  10 			(Brillouin zone mesh)
+<set_kmesh_large>= T
+ICST= 3    				(Born iterations)
+<MPI_SCHEME>= 2
+KEXCOR= 2
+--------------------------------------------------------------------------------
+EMIN      EMAX       TEMPR      NPOL      NPT1    NPT2     NPT3 (energy contour: only next line is read in)
+-0.30     1.10       502.78d0    10         4      14        4    <-- for scf
+--------------------------------------------------------------------------------
+RMAX= 7.0d0     GMAX= 65.0d0     (parameters for Madelung sums)
+================================================================================
+   * * *   C O N V E R G E N C E   * * *
+================================================================================
+QBOUND    NSTEPS   IMIX    STRMIX    BRYMIX    ITDBRY    FCM
+ 5.E-8     1         5       0.05      0.05      40       20.0
+--------------------------------------------------------------------------------

tests/KKRhost/test_inputs/test_24_BXCSCL/ref/out

+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+ !!! Most output written to output.myrank.txt files !!!
+ !!! please check these files as well               !!!
+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+     Screened Korringa-Kohn-Rostoker Electronic Structure Code
+                      for Bulk and Interfaces
+                    Juelich-Munich 2001 - 2018
+
+  Code version: v3.1-1755-g2013fc87
+  Compile options: intel mpi 
+  serial number for files: JuKKR_v3.1-1755-g2013fc87_intel_20210504115836
+ Number of MPI ranks used:   64
+
+*******************************************************************************
+
+ Calling MADELUNG3D
+ Exited MADELUNG3D
+ ++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ +++            SCF ITERATIONS START                +++
+ ++++++++++++++++++++++++++++++++++++++++++++++++++++++
+started on 2021/ 5/ 4 at 11:58:37
+               Ne spin dn  Ne spin up    m_spin
+          TOT  2.75857651  5.21686422    2.4583
+          TOT  3.05076882  4.97379043    1.9230
+      ITERATION   1 charge neutrality in unit cell =    -0.000000
+                    TOTAL mag. moment in unit cell =     4.381309
+                new E FERMI   0.6792696487  DOS(E_F) =    15.898434
+      ITERATION   1 average rms-error : v+ + v- =  1.1394D-08
+                                        v+ - v- =  2.4815D-09
+TOTAL ENERGY in ryd. :            -5082.25595695
+
+                 ++++++ SCF ITERATION CONVERGED ++++++
+*******************************************************************************
+Iteration finished on 2021/ 5/ 4 at 11:58:38
+ -------------------MEMORY CONSUMPTION REPORT-----------------------
+ 173 allocations and 294 deallocations, remaining memory(B):-18605626
+ Memory occupation peak: 20548 kB
+ For the array: "RHO2NSNM" in routine "main2"
+ -----------------END MEMORY CONSUMPTION REPORT---------------------