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Handle single-slice PEPS boundaries #492

Job	Run time
typecheck	29s
MPI (3 ranks)	59s
package	59s
MPI (2 ranks)	1m 7s
docs	2m 46s
test (3.12, extended, dev,test-extended,contraction)	31m 27s
test (3.12, core, dev)	1m 17s
test (3.12, vmc, dev,vmc)	18m 46s
test (3.10, core, dev)	1m 0s
test (3.11, core, dev)	4m 46s
	1h 3m 36s