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Add test of subclassing with cbook._define_aliases.

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Original file line number	Diff line number	Diff line change
`@@ -331,6 +331,42 @@ class Invalid:`
`331`	`331`	`cbook._define_aliases({'prop': ['alias1','alias2']})(Invalid)`
`332`	`332`
`333`	`333`
	`334`	`+deftest_define_aliases_subclass():`
	`335`	`+@cbook._define_aliases({'prop': ['alias']})`
	`336`	`+classBase:`
	`337`	`+def__init__(self):`
	`338`	`+self.call_count= {'Base:set_prop':0}`
	`339`	`+`
	`340`	`+defset_prop(self):`
	`341`	`+self.call_count['Base:set_prop']+=1`
	`342`	`+`
	`343`	`+classDerived(Base):`
	`344`	`+def__init__(self):`
	`345`	`+super().__init__()`
	`346`	`+self.call_count['Derived:set_prop']=0`
	`347`	`+`
	`348`	`+defset_prop(self):`
	`349`	`+self.call_count['Derived:set_prop']+=1`
	`350`	`+`
	`351`	`+b=Base()`
	`352`	`+b.set_prop()`
	`353`	`+assertb.call_count['Base:set_prop']==1`
	`354`	`+b.set_alias()`
	`355`	`+assertb.call_count['Base:set_prop']==2`
	`356`	`+`
	`357`	`+d=Derived()`
	`358`	`+d.set_prop()`
	`359`	`+assertd.call_count['Base:set_prop']==0`
	`360`	`+assertd.call_count['Derived:set_prop']==1`
	`361`	`+d.set_alias()`
	`362`	`+assertd.call_count['Base:set_prop']==0`
	`363`	`+assertd.call_count['Derived:set_prop']==2`
	`364`	`+`
	`365`	`+Base.set_alias(d)`
	`366`	`+assertd.call_count['Base:set_prop']==1`
	`367`	`+assertd.call_count['Derived:set_prop']==2`
	`368`	`+`
	`369`	`+`
`334`	`370`	`fail_mapping= (`
`335`	`371`	`({'a':1}, {'forbidden': ('a')}),`
`336`	`372`	`({'a':1}, {'required': ('b')}),`

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