Fix partial eigenspectrum indexing convention for ScaLAPACK API #1248
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PR #1194 introduced the possibility to compute a partial eigenspectrum. The convention for the C-DLAF and C-ScaLAPACK APIs used was the same, i.e. base 0 indexing. As pointed out by @rasolca in eth-cscs/DLA-Future-Fortran#27 (review) it would be better to have base 1 indexing for the C-ScaLAPACK API (while retaining base 0 indexing for the C-DLAF API).
This PR changes the indexing convention of the C-ScaLAPACK from base 0 to base 1 indexing.