Bioinfokit

- The error message for volcano, inverted volcano, and MA plot updated
when there are no significant or non-significant genes (issue 7)
- The `vcf_anot` function output updated for strand information

- The manhatten plot updated to add the lables in sorted order for numerical strings
- The manhatten plot updated to add figname option

- TPM normalization function added

- RPKM normalization function added

- gene expression raw count normalization class added as 'analys.norm'
- CPM normalization function added

- check for lfc_thr and pv_thr added