Viperleed

Release of **TensErLEED v2.0.0**, compatible with **viperleed.calc v1.0.0** (and v0.12.0).
See also the ViPErLEED homepage [viperleed.org](viperleed.org) and the [main repository](https://github.com/viperleed/viperleed).

This release is identical in functionality to TensErLEED v1.7.6.

**Note:** TensErLEED and everything in the viperleed/tensorleed directory will be moved to a separate repository with the next release.
- Fixes and error handling (writing error messages to where one would expect them).

**Full Changelog**: https://github.com/viperleed/viperleed/compare/v0.10.0...v0.11.0

- removed random_.c (replaced with Fortran version)
- removed redundant lib.mpi files.

- Removed readin of beams to calculate PQFEX, which is redundant to the beam indices NPU specifying beams to calculate from the beamlist. This does not affect functionality, as intensities for all beams not contained in NPU would anyway have been set to zero. Note that this modifies the structure of FIN (the explicit second list of beams by index is now removed).
- Fixed another precision issue affecting calculations for large LMAX

- refcalc: major improvements to speed over v1.71
- fixed an issue where R-factor functions of TensErLEED in both standard rfac and in the search exhibited sudden jumps for some variations, especially clear in error calculations.
- included preliminary implementation of new EEASiSSS version

- Removed variable VO (which was entered equal to zero in muftin.f) from src- and lib-files
of ref-calc, delta, search, search.mpi, search_FK, search_FK.mpi, and superpos codes.
- Removed variable FR from the ref-calc code.
- Made VPI (=V0i) and WORKFN input parameters for the ref-calc, next to parameter ASE.
- Changed phaseshift input. Can be switched between classical style (ViperLEED-v1 version) and new (columnwise) style.
Switch proceeds via phaseshift format Parameter PSFMT: 1: old; 2: new.
- The parameters for the calculation of the inner potential (from Rundgren's program)
are read in from the header of the phaseshift file. Attention: Fixed format for C's required!