faster and more stable

v.0.3.0

• Update that makes my coding life easier.
• Several internal functions to convert from a tidy dataframe to:
  vcf, plink, genind, genlight, gtypes, hierfstat, genepop, structure and betadiv
  are now separate modules available to users (look for write_... with the outputformat)
• New function genomic_converter: If you want the to convert from the supported
  input file formats to many output formats, at once, this is the function.
  With the new function genomic_converter, import and imputations are only
  done once, saving time if you were generating different output WITH imputations.
• Change: all the vcf2... functions (excep vcf2dadi) are now a shorcut of genomic_converter.
  This is particularly interesting and faster if you were generating different
  output WITH imputations. This makes the functions vcf2... and genomic_converter
  easier to debug for me and more stable for users.
• Deprecated: the haplo2... functions are all deprecated and replaced by
  genomic_converter, except haplo2colony that requires so many arguments that it
  would be too complicated, for now, to integrate with genomic_converter.
• New feature: when arguments pop.select, blacklist.id and imputation.method
  are used, the REF and ALT alleles are now re-computed to account for the filters
  and imputations.