Delete empty "History" sections

Delete empty "History" sections

* lisp/bs.el:
* lisp/calendar/timeclock.el:
* lisp/cedet/semantic/bovine/grammar.el:
* lisp/cedet/semantic/grammar.el:
* lisp/cedet/semantic/wisent.el:
* lisp/cedet/semantic/wisent/comp.el:
* lisp/cedet/semantic/wisent/java-tags.el:
* lisp/cedet/semantic/wisent/wisent.el:
* lisp/erc/erc.el:
* lisp/net/newst-treeview.el:
* lisp/recentf.el:
* lisp/ruler-mode.el:
* lisp/textmodes/remember.el:
* lisp/thumbs.el:
* lisp/tree-widget.el:
* lisp/vc/vc-hg.el: Delete empty "History" sections.

* lisp/cedet/semantic/grammar.el
(semantic-grammar-header-template): Don't add "History" section to
generated file.