Checkqc

**New release since version number never was incremented in the last one**

Patch updates:
- Bioconda information added to README
- Docs building fixes
- Updated some QC thresholds in the default config

Patch updates:
- Bioconda information added to README
- Docs building fixes
- Updated some QC thresholds in the default config

Patch release:
- Fixed problem where NovaSeq SP couldn't be run 88

It is possible to instruct CheckQC to use the closest read length if the read length of the run is not found in the config. In case of a tie between two read lengths, the longer read length (with stricter QC criteria) will be used.

Usage:
` $ checkqc --use-closest-read-length <RUNFOLDER>`

This parameter can be supplied to the webservice as a query argument:
`curl -s -w'\n' localhost:9999/qc/170726_D00118_0303_BCB1TVANXX?useClosestReadLength | python -m json.tool`

It is now possible to downgrade errors to warnings for specific handlers. Prior to evaluating the QC criteria, the config will be updated so that `warning threshold = error threshold` and `error threshold = unknown`. Read more about usage in the docs.

It is now possible to specify white-list indexes that only cause warnings even if they occur above the significance level.