Having a single GCF prevented GCC calling, but also exited the rest of
the function that writes the clustering and visualization results. Now
results are properly written in that specific case.

- Fixes #1 (thanks @suare012!)
- Updates dockerfiles
- Adds environment.yml for easier conda installation

- Added transAT-PKS-like to the set of rules (PKSother)

- '--mibig', '--mibig13'  and '--query_bgc' options are working again

- Added compatibility with antiSMASH 5 annotations
- Added a filter to select only individual cluster (antiSMASH 4) or
region (antiSMASH 5) files ('--include_gbk_str'). Previously, we had
been using 'final' as a string to filter out complete genome files, but
this string no longer appears in antiSMASH 5 files.
- domain_whitelist.txt: commented example domain
- domains_color_file.tsv: added random colors for more domains

Family tree SVG now have proper scalable width

See merge request !45

Implement export function on GCF tree SVGs

See merge request !44

Added pan & zoom buttons for GCF pages

Closes #9

See merge request !43

Fix text overlaps in overview screen

Closes #11

See merge request !42

Fix overview screen only shows output from 1 run in the case of multiple runs via --cutoffs

See merge request !41

Added requirements.txt for easier installation using pip / conda

See merge request !40

HTML Visualization will now produce separate outputs for each cutoff specified in "--cutoff"

See merge request !39

- Gene and protein names will have colons in their names substituted by
underscores to avoid issues further on (colons are used internally to
split information contained in the sequences' header)
- Added a new bundle of MIBiG BGCs (version 1.4). Version 1.3 is still
kept for reproducibility

Family tab now explicitly mentions Clan-related information

See merge request !37