half way of moving exchange correlation stuff to common

cmake/source_list_KKRhost.txt

cmake/source_list_KKRimp.txt

source/KKRimp/arrayparams.f90

source/KKRimp/ecoub.f

source/KKRimp/epotinb.f

source/KKRimp/exchangecorrel.f

source/KKRimp/initldau.F

source/KKRimp/kkrflex.F90

source/KKRimp/phicalc.f

source/KKRimp/rhototb.f90

source/KKRimp/vxcdrv.f90

source/common/corlsd.f90

source/common/cpw91.f90

source/common/global_variables.F90

source/common/gradr.f90

source/common/gradrl.f90

source/common/gxcpt.f90

source/common/mkxcpe.f90

source/common/mkxcpe2.f90

source/common/simpk.f90