Add migrate control to Auth.wiki()
Add migrate control to Auth.wiki()

The Auth.wiki() function does not allow for control of the migration
settings, always defaulting to migrate=True. In some instances the
developer may want to not force migration. This change adds the
ability to set the migrate option. Fake_migrate was not added but
can be if desired.

willimoa/pydal,stephenrauch/pydal,kmcheung12/pydal,michele-comitini/pydal,web2py/pydal,manuelep/pydal,niphlod/pydal