Log Message:
Changes 2.5.2:
Cross-platform fix for checksumming code. This is
*incompatible* with version 2.5.1. As a temporary
workaround, setting "bugcompatibility 251" will maintain
compatibility with release 2.5.1 for little-endian platforms
(e.g. Intel). This will be removed from the final production
release.

Upgrade to Inno Setup 4.

More documentation fixes.

Increased the default thread stack size to 64k and
added "threadstacksize" for debug/test purposes.

Fix handling of HTTP/1.1 responses from proxies.

Added acceptconnecttimeout (supersedes "connecttimeout")
along with connectattempts, serverconnecttimeout and
targetconnecttimeout.

Fixed bug with "clienthost" not being honoured when Zebedee
was used as a service.