[Mediawiki-api] BREAKING CHANGE: more useful behavior when using md5 together with appendtext/prependtext in action=edit

[Roan Kattouw]

As of r36306 [1], the behavior of action=edit's md5 parameter in 
conjunction with the appendtext and prependtext parameters has changed. 
Instead of requiring the MD5 hash of the entire article text (which 
makes appendtext and prependtext kind of useless), the md5 parameter now 
requires the hash of the concatenation of the prependtext and the 
appendtext parameter. For example, if you set 
prependtext=Foo&appendtext=bar , you'll need to set the md5 parameter to 
the result of md5('Foobar') .

Roan Kattouw (Catrope)

[1] http://svn.wikimedia.org/viewvc/mediawiki?view=rev&revision=36306