Adaptation to dplyr 1.1.0/dtplyr 1.3.0 and bugs corrections

• Examples adapted to match changes in {dplyr} 1.1 and {dtplyr} 1.3: most functions now return the same kind of object (data.frame -> data.frame, data.table -> data.table) and data.tables are not managed as lazy data frames by default any more.
• Original print() methods are restored for data.frame/data.table (the method for tibbles is not used any more)
• scount(), stally(), sadd_count() and sadd_tally() now use collapse::fcount() and are completely reworked
• sunite() haș a bug corrected where the value of col= was not used properly.
• %<-% and %->%do not evaluate in a try() construct. Error messages are not silently swallowed any more. collect.default(), which returns the objet intact is added to avoid collect()errors that previously justified thetry()` construct.