Put table style and col sizes under direct user control

Put table style and col sizes under direct user control

* contrib/lisp/org-lparse.el
(org-lparse-table-get-colalign-info): Renamed
`org-forced-aligns' to `org-col-cookies'.  Renamed local
variable `forced-aligns' to `col-cookies'.
(org-lparse-format-table-row): With the introduction of
`org-col-cookies' property the internal structure of
`org-lparse-table-colalign-info' has changed.  Do the right
thing while setting up col alignment.  Pass on the colwidth
property as horiz-span arg of `TABLE-CELL' callback.

* contrib/lisp/org-odt.el (org-odt-begin-table): Let the table
style be settable throught #+ATTR_ODT line.  By default tables
are configured to occupy 90% of paper width.  This is too big
for smaller tables.  For aesthetic reasons, a user might
prefer that such tables of shorter width and thus specify a
different style.
(org-odt-end-table, org-odt-format-table-cell): Honor colwidth
specification.

* contrib/lisp/org-xhtml.el (org-xhtml-format-table-cell): Fix
signature as mandated by changes in TABLE-CELL callback.

See comments in the earlier patch. See also
http://lists.gnu.org/archive/html/emacs-orgmode/2011-08/msg01053.html