v3.4.0

BioSequences v3.4.0

Diff since v3.3.0

Merged pull requests:

• Rewrite counting of BioSequence (#316) (@jakobnissen)
• Optimise some LongSequence constructors (#320) (@jakobnissen)

Closed issues:

• What's up with the strange two-argument counting methods? (#314)
• Rewrite bitpar compiler (#315)