Issue 1160 missing url fragment

[anatoly-scherbakov]

Fixes #1160

Proposed Changes

• Refactored out _create_input_source_from_location() from create_input_source() in vew of that function being too large;
• Removed .defrag() call which removed the URL fragment part of the named graph IRI;
• Added a test to ensure that now, when querying against a named graph using FROM NAMED, we will have more predictable graph IRI to choose via GRAPH statement.

[coveralls]

Coverage increased (+0.07%) to 75.631% when pulling 7c7f05c on anatoly-scherbakov:issue-1160-missing-url-fragment into b3bb4db on RDFLib:master.

[coveralls]

Coverage increased (+0.07%) to 75.631% when pulling 7c7f05c on anatoly-scherbakov:issue-1160-missing-url-fragment into b3bb4db on RDFLib:master.