Bioinfokit

- Tukey HSD test added to perform multiple pairwise comparisons (`bioinfokit.analys.stat.tukey_hsd`)

- new option `mrna_feature_name` added in `analys.gff.gff_to_gtf` if the name of the feature (column 3 of GFF3 file) of
protein coding mRNA is other than 'mRNA' or 'transcript' (e.g. some GFF3 file has this feature named as
protein_coding_gene )
- `dim` option added to `visuz.cluster.screeplot`, `visuz.cluster.pcaplot` and `visuz.cluster.biplot` to control the
figure size

- `seqcov` moved to `fastq` class
- `sra_db` function added under `fastq` class for batch download of FASTQ files
from NCBI SRA database

- In t-test, the one sample t and paired t-test added
- Two sample t-test switched to class based method
- t-test function name changed to `ttest` from `ttsam`
- programmatic access to chi-squared independence test dataset added
- boxplot removed from t-test
- 'adjustText' module added in `setup.py` (issue 12)

- In chi-squared test, the sum of probabilities is rounded to 10 for exact sum in case of floats

- chi-squared goodness of fit test added under the `stat.chisq`
- chi-squared independence test updated for output as class attributes and mosaic plot removed
- `mergevcf` renamed to `concatvcf` to keep with conventional naming (issue 9)
- programmatic access to chi-squared independence test dataset added
- `marker.vcf_anot` function updated for tab-delimited text output