localrepo._tag: add a seek before writing the new tag Some systems require a seek (or flush) between read and write operations on the same file object. This should fix issue838.

convert: use 'unknown' and '0 0' if commit author or date weren't specified Closes issue873.

httprepo: use separate handlers for HTTP and HTTPS This is needed to keep the code in keepalive.py from sharing the same connection between HTTP and HTTPS. 52ce0d6bc375 explains why we were using a single handler. This should fix issue892.

move __del__ from httprepository to basehttphandler This should prevent the next patch from reopening an issue fixed by 0d94e4a3ddb4.