[O] unintended strike-through in table

[Skip Collins]

When I open the following table in org, the characters from the first
+ symbol in +bar to the last + symbol on the next line are struck out,
i.e. drawn with a line through the text.

#+STARTUP: showall
* foo
| C | D    |
| E | +bar |
|---+------|

I do not believe this is intended behavior for +strike-through+ text.
The + symbol serves triple duty in org syntax as a an indicator for
+stricken words+, a line drawing symbol in tables, and a #+keyword
prefix.

I see little reason to continue to support +strike-through+ text.
Perhaps the simplest solution would be to deprecate stricken text and
disable it by default, allowing for an option to turn it on for
backward compatibility.