Update to 0.46. User-visible changes:

• reset tog blame view's scroll position if line count shrinks too much
• replace unprintable characters with '.' before passing them to curses
• allow editing of log message comments with 'got histedit'
• implicitly mark all files in work tree as up-to-date after rebase/histedit
• fix parsing of tag objects which lack a tag message; found in u-boot.git repo
• do not mix up repos if tog's -r option is used in a work tree