HTML Table column description

[pbelmann]

Each field in the html should have a tooltip with a description of its meaning.
We should collect all descriptions in this issue.

[wpaetzold]

Coverage: Average number of reads that cover found region according to the bam file (optional)
Gene ID: Name of the hit gene (names according to metagenome file)
HMM: Name of the HMM which achieves the hit
Class: Name of the class if hit HMM can be assigned according to search.yaml (optional)
Score HMM: Score of the HMM relating to the gene sequence
Evalue HMM: Evalue of the HMM relating to the gene sequence
Best Blastp hit: Name of the best blastp hit (to reevaluate the sequence region, hit by the hmm, is blasted against the ncbi database)
Evalue best Blastp: Evalue of the best Blastp hit relating to the gene sequence
Identity: Percentage of match between the best blastp hit and the gene sequence
Subject accession: Accession number of the found blastp hit
Subject titles: Names of the best blastp hit
Subject tax IDs: Taxa of found blastp hit
Subject IDs: Identification number of found subject
Links: Links to corresponding Pubmed-entries which containing at least one of the given keywords in their abstract (optional)
Gene sequence: Sequence section of the gene where the HMM achieves the hit