CS1520 code issue and auto-fix.
New Code Issue "Redundant base type specification"

Type is either mentioned in the base type list of other part, or it is
interface and appears as other's type base and contains no explicit
implementation.
Merge pull request #226 from leoowen19/master

New Code Issue "Redundant base type specification"
Fixed bug in block output.
Fixed some locations.
Redundant attribute parameters have now the right location set.
Fixed failing unit test.
Synced 'RedundantExtendsListEntryIssue'.
Improved some code issue description/reformatted some files.
Fixed project file.
Fixed issue text.
Fixed formatting bug.
Fix newlines in RedundantCatchIssueTests.
[CodeIssues] Fix RedundantThisQualifierIssue handling of fields being used inside variable initializers.
[CodeIssues] Fix handling of extension methods in RedundantThisQualifierIssue.
[CodeIssues] Avoid causing CS0135 in RedundantThisQualifierIssue.
Merge branch 'master', remote-tracking branch 'upstream/master'
New code action

Copy comments from base
Copy comments from interface
Merge pull request #228 from leoowen19/master

New code action
Merge branch 'master' into issue-fixes

Conflicts:
	ICSharpCode.NRefactory.CSharp/ICSharpCode.NRefactory.CSharp.csproj