SWC-1141: fix wiki history layout
Merge pull request #778 from jay-hodgson/release-27

SWC-1066: username support
Merge pull request #779 from jay-hodgson/SWC-1141b

SWC-1141: fix wiki history layout
SWC-1143: validate alias during registration, and when setting username on login
small update to message
add tests
Merge pull request #782 from jay-hodgson/SWC-1143

Swc-1143: check format up front, and check alias duplicates.
SWC-1152: improve logging by sending back exception message to the client when there is an open id error