Fix overflow of 32-bit signed integers when multiplying two 32-bit integers: cast to 64-bit integers first, otherwise matrices with number of elements > 2^31 (e.g. a 48,000x48,000 custom kernel matrix) will not work.
Accidental file included
Clang will not take int64_t as an index into a vector, add [] for int64_t in SGVector
Need a third operator[]

Because the uint32_t used to index vectors elsewhere now cannot choose
between index_t and int64_t (before it only had the choice of
index_t=int32_t)
Other try to fix ambiguities: a single operator[] with int64_t
Toy data generator for classification
Merge pull request #1740 from karlnapf/develop

corrections of typos
Merge pull request #1735 from van51/feature/data_gen

Toy data generator for classification
Minor updates to dimension reduction notebook
Merge pull request #1741 from iglesias/develop

Minor updates to dimension reduction notebook
Fixing deprecated functions in .R-files
‘real’, ‘as.real’ and ‘is.real’ were long-deprecated synonyms for the ‘double’ versions.
fix trailing whitespace
Merge pull request #1742 from besser82/fix_R

Fixing deprecated functions in .R-files
fix memory leak/erros in run_system
update news to 3.0.1
Update README_cmake
Merge pull request #1744 from iglesias/develop

Update README_cmake
Merge pull request #1731 from koenvandesande/fix_index_t_overflows

Fix overflows of index_t for large matrices
add int32_t / uint32_t SGVector access functions
add uint64_t index for access