Many bug fixes (tested on dozens of samples)

• Date added on every page of the report, major mutations are in bold.
• Bugfix: minvar now works evene when neither HCV nor HIV reads are present.
• Bugfix: find_subtype failed when reads from both HIV and HCV were present.
• Bugfix: when no RAS mutation is found, reportdrm failed.
• Bugfix: when the frequency of a mutation is 0.5/0.5, cns_max_freq was longer than the reference.
• Problems with an assert when all reads have indels: removed the assert, phase_mutations has limitations.