keep references of demons and constraints in python, ad-hoc way, make the slitherlink constraint working
keep references of demons and constraints in python, ad-hoc way, make the slitherlink constraint working

ThatRfernand/or-tools,google/or-tools,google/or-tools,ThatRfernand/or-tools,or-tools/or-tools,or-tools/or-tools,KapecK/or-tools,linsicai/or-tools,or-tools/or-tools,WendellDuncan/or-tools,KapecK/or-tools,KapecK/or-tools,legrosbuffle/or-tools,google/or-tools,KapecK/or-tools,ThatRfernand/or-tools,or-tools/or-tools,linsicai/or-tools,legrosbuffle/or-tools,WendellDuncan/or-tools,google/or-tools,linsicai/or-tools,legrosbuffle/or-tools,or-tools/or-tools,WendellDuncan/or-tools,WendellDuncan/or-tools,google/or-tools,KapecK/or-tools,linsicai/or-tools,linsicai/or-tools,KapecK/or-tools,legrosbuffle/or-tools,ThatRfernand/or-tools,or-tools/or-tools,WendellDuncan/or-tools,linsicai/or-tools,legrosbuffle/or-tools,ThatRfernand/or-tools,google/or-tools,WendellDuncan/or-tools