Resolve "data overlay should support element id"

added 13 commits

d8f01ce2...8a1c3f22 - 3 commits from branch master
77cf9226 - allow to filter by element id
e3f520f1 - test file modifed to produce less warnings
4cabe7e5 - common getElement method added
7a031fdc - common functionality for match and apply coloring added
4b9a0e62 - there is uniform way of storing BioEntity id in color schema
b9a880ab - unit test fixed (after changing way of accessing custom overlays)
2fcc2df4 - fix on parsing targets
e9c5e4ee - uniform way of providing info about element id and reaction id in the uploaded overlay
12749b55 - chembl provides more data to be ignored
27cb7515 - test data reduced to produce less warnings

unmarked as a Work In Progress

merged

mentioned in commit 3790ed25

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