Version 0.4.0 released

Changes:

• Fixed overflow for very large Bonferroni factors (affected auto-Bonferroni option on WGS of HG, for example)
• Reported base-counts and frequencies are now unfiltered, with the exception of Q<3 which is always removed
• Added Bonferroni option 'auto-ign-zero-cov'
• Added --force option for forced overwriting of files