ox-odt.el (org-odt-table-style-format): Use %s for inserting the rel-width property as a string

* ox-odt.el (org-odt-table-style-format): Use %s for inserting
the rel-width property as a string.
(org-odt-template): Fall back on a string for :rel-width.

Thanks to Derek Feichtinger for reporting this bug.
Merge branch 'maint'
org.el (org-use-speed-commands): Enhance docstring

* org.el (org-use-speed-commands): Enhance docstring.

TINYCHANGE