reversed logic in httpReq's allowCache argument

[FND]

httpReq appends a random parameter to the URL when the allowCache is true and omits that parameter otherwise - exactly the opposite of how it's intended.

Test case:

var allowCache = true;

var callback = function(foo, bar, baz) {
	console.log(arguments);
}
var req = httpReq("GET", "http://google.com", callback, null,
	null, null, null, null, null, allowCache);

Note that this might be the reason for recent importing issues.

[FND]

Fixed in changeset:9980.

Leaving ticket open for review.

[FND]

Fixed additional bug in changeset:10101, which should resolve this issue.