Embedded `EachOf` or `OneOf` can cause inordinately long resolution times

[hsolbrig]

An expression of the form:

<BloodPressureMeasurementShape> {
  rdfs:label  xsd:string ;
  :subject @<PatientShape> ;
  :hasmeasurementDate  @<BPDateShape> ;
  :valueSBP @<SBPvalueShape> ;
  :valueDBP @<DBPvalueShape> ;
  :valueABP @<ABPvalueShape>? ;
  (:hasMethod  @<BPMeasurementInvasiveMethodShape> |
   :hasMethod @<BPMeasurementNoninvasiveMethodShape> ) ;
  :hasLocation @<BPMeasurementLocationShape>? ;
  :hasType @<DEPShape>? ;
  :isAffectedBy @<BodyPositionShape>?
}

Goes away for a long time.

(Reported by Ronald Cornet, University of Amsterdam)

[hsolbrig]

Fixed in https://github.com/hsolbrig/PyShEx/commit/392e1bf4fac95705772e1c36ea6e8c6372d5cb13

Restructured the EachOf processor to include exactly the set of triples needed for evaluation