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includes the usual one instead of copying it over with changed paths.

Implemented --build-dir option making it possible to have multiple external builds configured differently sharing the same source

some optimizations and corrections to ctr kernels, that don't yet fix the bug raised by libtensor tests

2. Changed function_timers and print_timers to use stack rather than heap

turned off trivial transposes, and added code that makes sure the B tensor is kept in place for summation.

Added timer epochs to ccsd

Also implemented threading into redistribution with reordering (ror) and made it default.

Everything works except for Aq CCSDT

Conflicts:
	src/tensor/untyped_tensor.cxx

made summation permutation check if only one of matched groups is antisymmetric, and unpack if so

Added proper diagonal rescaling and integrated it into contractions so they no longer need to be unpacked for preserved and summed SY groups.

Also made contraction unfold_broken_sym compare symmetries rather than check with respect to only NS

changed the way symmetrization and desymmetrization, mostly for summation.  Now the product can be desymmetrized and operands can be presymmetrized

Changed the way symmetrization/desymmetrization is done, so that SY desymmetrized tensor do not have data from the original SY tensor and an auxillary zero SY tensor is used to symmetrize before adding to the original SY tensor

1. Added capability (via constructor) to repack tensor data into a different packed symmetric layout without doing the normal symmetrization permutations that happen during sum
2. Fixed bug associated with C["ij"]=A["ij"]*B["ijkl"] where C and A are SY and B is fully NS.
3. Getting (2) to work in parallel required resolving a bug associated with desymmetrization (in the two unfold_broken_Sym functions), which were changing symmetry without changing sym_table, and as a result yielding extra mapping restrictions.

The bug fix to (3) might improve performance generally.