handyFunctions - Useful Functions for Handfully Manipulating and Analyzing Data with Data.frame Format

Some useful functions for simply manipulating and analyzing data with data.frame format. It mainly includes the following sections: ReformatDataframe (reformat dataframe with the modifiers), InteractDataframe, and Post-VCF (for downstream analysis for data generated from vcftools (Petr Danecek, 2011) (<http://dx.doi.org/10.1093/bioinformatics/btr330>) or plink (Chang CC, 2015) <10.1186/s13742-015-0047-8>.