(bug 529, bug 12974) alter behaviour of the table- and template-parser:

(bug 529, bug 12974) alter behaviour of the table- and template-parser:
* Remove the hack from bug 529 which inserts a newline when the template text begins with any block character; this breaks many things in many exciting ways.  I've left it in for now when the text begins with a wikitable, as that markup can't be mistaken for anything else.
* Instead, move the contents of a table cell onto a new line for parsing, so that linestart elements (including nested tables) will parse as normal.

This means that structures like

{|
| {{template-containing-wikilist}}
|}

Will still work, but for the right reason, and structures like

{|
| style="color:{{template-containing-hexcode}}" | Foo
| * Bar
| {|
   | Look at me, I'm nested!
  |}
|}

Will all now start to work.  Structures like

* Foo {{template-containing-wikilist}}

Will now not, but honestly, should they?