Fix fidelity per site.
The K_left matrices are 'bras'. Try to make sure we use them consistently.
Update tdvp_common.pxd.
Supply c sources (cython-generated) and build those during setup.
Fix inner products for 'bra' vectors. Give them their own adot_noconj().
Fix a small bug in calc_BHB_prereq_3s.
Merge pull request #4 from mlewe/master

Fix a small bug in calc_BHB_prereq_3s.
Optimize mps gen update without restore_CF a little.
Fix take_step_RK4 (gen) for 3-site hamiltonians. Also, update should not truncate by default!
Merge branch 'master' of github.com:amilsted/evoMPS into dev
Make building extensions optional.
Variable to determine gauge-fixing mode used in gen.
Sandwich cleanups. Fix RK4 update mode (new gauge-fixing breaks dependency assumptions).
Fix dtypes of simple matrix objects.
Update tdvp_common.c to reflect previous commit to tdvp_common.py.
Some cleanups. Match tdvp gen update() with tdvp mps.
Update mps gen update() function.
Careful with the eigenvalues...
Add some more output to go() in tdvp_samdwhich. Change tolrance to use mean eta... good?
Fix full-rank condition.