Release notes

Version v0.11.1 - 2024.04.12

EC.ms (previously of type MSys) in ECInfo is renamed to EC.system (of type AbstractSystem).
ECdriver routine is moved to CCDriver module and renamed to ccdriver. The fcidump keyword-argument is now empty by default. It doesn't accept list of methods anymore, only one method at a time.
The driver routines and macros return energies as NamedTuple.
The SVD methods have to be called now as SVD-<methodname>, e.g., svd-dcsd.
The @svdcc macro is renamed to @dfcc macro and calls the dfccdriver routine, which is intended as a driver routine for all DF-based correlation methods (i.e., methods which don't use the EC.fd integrals).

Renamed function active_orbitals to oss_active_orbitals.
Renamed function calc_ccsd_resid to calc_cc_resid.
ECdriver and oss_active_orbitals now return named tuples.
Improved documentation of occupation strings syntax.
Switched to Atom and FlexibleSystem from AtomsBase as the internal representation of the molecular system. The basis set is stored for each atom as :basis property (as Dict{String,String}, e.g., system[1][:basis]["ao"]). One can also set :basis property for the whole system.
Renamed macro @opt to @set. @opt is now an alias of @set.

The automatically generated UCCSDT and UDC-CCSDT methods have been added to the docs.
SCS-MP2, SCS-CCSD and SCS-DCSD

Cholesky threshold thr is used for integral decomposition only. Threshold for elimination of redundancies is now called thred.
Files for amplitudes and multipliers are now called ..._1, ..._2,... for singles, doubles, etc.

Fix dressing of a three-internal integral (which slightly affected the energy of CCSD/DCSD with use_kext=false).

Add various methods (DF-[U]HF, BO-[U]HF, [U/R]CCSD, [U/R]DCSD, SVD-DCSD, SVD-DC-CCSDT, CCSD(T), ΛCCSD(T), ΛDCSD...).
Setup macros, options etc.
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