Evo: dbquery::connect() new argument "force_new", if true a new connection is requested, else use last opened connection returned by driver. dbquery::start_transaction executes connect($force_new=true)

FIx: if boolean history in cycle, db connexion are lost, instanciate db connexion at the beginning of the history process

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Fix: pass _sqlLink to db engine query function to use object connection instead of last instanciated db_query object 

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