refactoring by splitting of dbcsr_internal_operation.F into dbcsr_mm_cannon.F, dbcsr_mm_multrec.F, dbcsr_mm_csr.F, dbcsr_mm_driver.F, and dbcsr_mm_types.F (Ole Schuett).


git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@12644 bac0169d-1eea-4375-b5f6-f89d2ced9994