Infobox: experiment w/ attribute/value extraction from existing sites

[philipn]

From @philipn on December 30, 2012 1:47

See https://github.com/philipn/localwiki_table_extraction

• infer infobox datatyes
• advanced import of k, v via api (maps types)
• removal of old tables via API

Copied from original issue: localwiki/localwiki#422