Split file elpa2.F90 into elpa2.F90 and elpa2_compute.F90
As in a previous commit for elpa1.F90, for automatic generation of documentation elpa2.F90 has been splitted in two files, in order to have a lean, easy-to-understand user interface: elpa2.F90 the visible user functions, which provide the library calls. The usage is the same as before elpa2_compute.F90 all internal routines, which are used by ELPA2, but which are never called external of the library by a user. These functions are now "hidden" in the module elpa2_compute, which is used by ELPA2. The procedures in elpa2_compute.F90 are identical to the ones in elpa2.F90 before this split commit. The only -- but quite a lot of them -- changes are intendation changes.
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