Reduce version number duplication in etc/refcards

Reduce version number duplication in etc/refcards

* etc/refcards/emacsver.tex: New file.
* etc/refcards/calccard.tex, etc/refcards/cs-dired-ref.tex:
* etc/refcards/cs-refcard.tex, etc/refcards/cs-survival.tex:
* etc/refcards/de-refcard.tex, etc/refcards/dired-ref.tex:
* refcards/emacsver.tex, etc/refcards/fr-dired-ref.tex:
* etc/refcards/fr-refcard.tex, etc/refcards/fr-survival.tex:
* etc/refcards/orgcard.tex, etc/refcards/pl-refcard.tex:
* etc/refcards/pt-br-refcard.tex, etc/refcards/refcard.tex:
* etc/refcards/sk-dired-ref.tex, etc/refcards/sk-refcard.tex:
* etc/refcards/sk-survival.tex, etc/refcards/survival.tex:
* etc/refcards/vipcard.tex, etc/refcards/viperCard.tex: Include emacsver.tex.
* refcards/calccard.tex (\emacsversionnumber):
Rename to \versionemacs, same as all the other refcards.
* etc/refcards/Makefile (ENVADD): New variable.
(sk-dired-ref.pdf, sk-survival.pdf, pl-refcard.pdf)
(%.pdf, %,dvi, sk-dired-ref.dvi, sk-survival.dvi, pl-refcard.dvi):
Depend on emacsver.tex.  Add "." to TEXINPUTS for TeX commands.

* admin/admin.el (set-version): Set major version in
etc/refcards/ru-refcard.tex and etc/refcards/emacsver.tex.
(set-copyright): In etc/refcards, only change ru-refcard.tex
and emacsver.tex.

* admin.el (cusver-scan, cusver-check): Bind local variables.

* .bzrignore: Add etc/refcards TeX intermediate files.