[lxml-dev] String parameters to xslt transformation

[Alexander Shigin]

lxml lacks ways to apply an external parameter containing both single
and double quotes. 
 
The patch adds `transform` method to XSLT object with `params` and
`strparams` argument. `params` works like `**kw` of `__call__` method
(i.e. you still need to surround string literals with quotes).

`strparams` are treated literally, so you do not need to use any
escaping or quotes.

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