Investigate impacts of read filtering on PacBio data

[sainsachiko]

Investigate effects of read filtering on results with below approaches:

• Blastn (current approach)
• hifi-trimmer
• HiFiAdapterFilt
• No trimming

[muffato]

Supersedes #151, #116, #114

[muffato]

FYI, our current approach is just a reimplementation of HiFiAdapterFilt. This shell script has got the same blastn and awk commands as in our sub-workflow.