Header of the proteins for search engines

@husensofteng the header of the proteins should be modified to be understood by SEARCH engines. SearchGUI don't understand the ENSEMBL ids. We probably need to move to the following header (
https://github.com/compomics/searchgui/wiki/DatabaseHelp#non-standard-fasta):

```
>generic[your tag]|[protein accession]|[protein description]

or

>generic[your tag]|[protein accession]
```

Note that `[your tag]` can be empty.

Examples:

```
>generic_contig-535081|AC:123132|Hypothetical protein
>generic|AC:123132|Hypothetical protein
>generic|AC:123132
```

No file or test is named. Locate the code that generates protein FASTA headers, then compare its output with the SearchGUI non-standard FASTA examples linked in the issue; done means generated headers follow the requested generic|accession|description or generic|accession format.

Written by the indexing model from the issue text.