turn revealed incorrect expectations the tests make. These tests
have been updated.
+ * "git-shell" rejects a request to serve a repository whose name
+ begins with a dash, which makes it no longer possible to get it
+ confused into spawning service programs like "git-upload-pack" with
+ an option like "--help", which in turn would spawn an interactive
+ pager, instead of working with the repository user asked to access
+ (i.e. the one whose name is "--help").
+
Also contains various documentation updates and code clean-ups.