socialranking 1.1.0

• Added L2Scores() and L2Ranking(), along with aliases lexcel2...()
• Added LPScores() and LPRanking(), along with aliases lexcelP...()
• Added LPSScores() and LPSRanking(), along with aliases lexcelPS...()
• Fixed kramerSimpsonScores() implementation which was not in line with the official definition
• Changed succeq to succsim notation in documentation to reflect modern literature