Fetch untracked pull requests in Qulacs

[kodack64]

For merging qulacs-osaka to qulacs, I've merged the three following pull requests that are applied only to qulacs.

276: https://github.com/qulacs/qulacs/pull/276 I've added several tests on evaluating expectation values that are dropped in the current dev. I have modified several tests since qulacs-osaka will raise exceptions.

293: https://github.com/qulacs/qulacs/pull/293 I've fixed the problem that the copy of composition gates incurred memory leak.

300: https://github.com/qulacs/qulacs/pull/300 Bugfix for tensor product for density matrix with different size outputs wrong results.

Updates:6/22 Two more PRs are added

306: https://github.com/qulacs/qulacs/pull/306 Memory leak in creating operators from openfermion files

315: https://github.com/qulacs/qulacs/pull/315 Bugs in calculating odd-Pauli-Y observables for density matrices

[codecov-commenter]

Codecov Report

Merging #351 (cd930ba) into dev (93648f0) will increase coverage by 0.16%. The diff coverage is 69.56%.

@@            Coverage Diff             @@
##              dev     #351      +/-   ##
==========================================
+ Coverage   71.00%   71.17%   +0.16%     
==========================================
  Files          84       84              
  Lines        5971     5977       +6     
==========================================
+ Hits         4240     4254      +14     
+ Misses       1731     1723       -8     

Impacted Files	Coverage Δ
src/cppsim/utility.hpp	100.00% <ø> (ø)
src/csim/stat_ops_dm.cpp	33.02% <0.00%> (ø)
src/cppsim/gate_general.hpp	56.09% <28.57%> (+0.32%)	:arrow_up:
src/cppsim/pauli_operator.cpp	71.27% <100.00%> (+1.11%)	:arrow_up:
src/cppsim/pauli_operator.hpp	95.00% <100.00%> (+1.25%)	:arrow_up:
src/csim/stat_ops_expectation_value.cpp	88.60% <0.00%> (-7.60%)	:arrow_down:
src/csim/update_ops_pauli_multi.cpp	65.00% <0.00%> (+0.62%)	:arrow_up:
src/cppsim/exception.hpp	15.00% <0.00%> (+5.00%)	:arrow_up:
src/csim/update_ops_matrix_dense_single.cpp	98.87% <0.00%> (+10.11%)	:arrow_up:

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[forest1040]

LGTMです！