Add "match" attribute in ambiguous cases

I checked all `<if>` and `<else-if>` elements. If the element doesn't carry the "match" attribute, and carries multiple test attributes and/or has at least one test attribute that contains a space, `match="any"` is added to the element.

I used the following snippet in csl-reindenting-and-info-reordering.py:

```
    #test all cs:if and cs:else-if elements
    #for those elements without "match", but with either a space in one of the
    #conditional values, or with multiple conditionals, add "match" set to "any"
    try:
        ifElements = styleElement.findall(".//{http://purl.org/net/xbiblio/csl}if")
        elseifElements = styleElement.findall(".//{http://purl.org/net/xbiblio/csl}else-if")

        ifElements = ifElements + elseifElements

        for ifElement in ifElements:
            ifElementAttribs = ifElement.attrib
            if not("match" in ifElementAttribs):
                if(len(ifElementAttribs)>1):
                    ifElement.set("match","any")
                else:
                    for ifElementAttrib, ifElementAttribValue  in ifElementAttribs.iteritems():
                        if(" " in ifElementAttribValue):
                            ifElement.set("match","any")
    except:
        pass
```