Release v6.1.2

Update libcint version tag to align with the new release of qcint

Libcint 6.1.1

• Add explicit SSE3 instructions for int2e

Libcint 6.1.0

Add new integral int1e_grids_ipip

Libcint 6.0.0

• Add polynomial root finder using the eigenvalue algorithm
• Fitting Rys roots of SR integrals with Chebyshev polynomials
• Remove GTG integrals which are erroneous in previous versions
• Remove coulerf integrals which has been covered by regular int2e functions

Libcint 5.5.0

• Fix memory leak issue in int4c1e
• New integrals related to LRESC
• Supports Gaussian charge model for int1e_grids

Libcint 5.4.0

Add constant PTR_FRAC_CHARGE for QM/MM interface in PySCF

Libcint 5.3.0

• Improves rys-roots numerical stability in the near-zero limit

Libcint 5.2.2

• Improves rys-roots finder accuracy
• Filters some warning messages in rys-roots function

Libcint 5.2.1

• Improve error handling for SR-ERI integrals

Libcint 5.2.0

• Optimize short-range ERI integral screening