v0.6.1

• depth tool:
  • new option -m (--fix-mate-overlaps) for proper counting of overlapping read pairs (#204)
  • fixed a rare bug occurring when two consecutive records have same position but different reference (#193)
• filtering (all tools):
  • empty string is now accepted (#191)
  • new string fields are recognized: strand (+/-), ref_name, and mate_ref_name (#203)