SES-1081 fix in SameTermFilterOptimizer to check for existence of
BindingSetAssignment.
SES-1794 added HTTPClient.initialize() to allow (re)initialization of
connection manager after shutdown and reinit of encapsulating
Repository. Added compliance test for all Repository implementations,
all greenline.
Merge remote-tracking branch 'origin/2.7.x' into ses-1794

Conflicts:
	core/http/client/src/main/java/org/openrdf/http/client/HTTPClient.java
Add test for SPARQL/JSON regression with respect to ancient unused
ordered and distinct fields
Add support for silently parsing ordered and distinct SPARQL/JSON fields
Merged in ses-1794 (pull request #112)

SES-1794 fix for JVM termination hanging on HttpConnectionManager cleanup thread
Merged in ses-1081 (pull request #111)

SES-1081 fix in SameTermFilterOptimizer to check for existence of VALUES clause