Merge transcripts into a single database

merge_transcripts(transcript_files, transcript_folder, what = "cdna",
  out = "ensembl_transcripts.fa.gz")

Arguments

transcript_files	A data table as returned by `download_bacterial_transcripts`.
transcript_folder	In which folder to look for transcripts.
what	The type of database, either "cdna" or "protein".
out	The filename for the DB. Will be compressed and saved in the transcript folder.

The transcript counts for each file.