GH-429 other indexes

[ate47]

Issue resolved (if any): #429

Description of this pull request:

Add the ability to use multiple indexes to increase the efficiency of the queries.

It is done using 2 options:

# say which index to add
bitmaptriples.index.others=ops,osp,pos,pso,sop
# disable FoQ index
bitmaptriples.index.noFoQ=true

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Please check all the lines before posting the pull request:

• I've created tests for all my changes
• My pull request isn't fixing or changing multiple unlinked elements (please create one pull request for each element)
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• All my commits have relevant names
• I've squashed my commits (if necessary)