AddWikiPage adds a new wiki page with a given wikiPath.
DeleteWikiPage deletes a wiki page identified by its path.
EditWikiPage updates a wiki page identified by its wikiPath, optionally also changing wikiPath.
FilenameToName converts a wiki filename to its corresponding page name.
InitWiki initializes a wiki for repository, it does nothing when repository already has wiki.
NameToFilename converts a wiki name to its corresponding filename.
NameToSubURL converts a wiki name to its corresponding sub-URL.
NormalizeWikiName normalizes a wiki name