Log Message:
Update to 1.3512

Upstream changes:
1.3512    2019-03-31 20:10:08+01:00 Europe/London
Promoting previous trial release 1.3511 to stable.

1.3511    2019-03-29 11:16:08+00:00 Europe/London (TRIAL RELEASE)
[BUG FIXES]
 - More session cookie handling fun - avoid causing test failures in dependencies
   in some cases (e.g. RT #128911 and others)

[ENHANCEMENTS]
 - hold session in SharedData, to avoid reading the session contents every time
   anything is requested, could be a performance win

1.3510    2019-03-19 14:42:26+00:00 Europe/London
Promoting previous trial release 1.3501  to stable.
Fix #1204 - more proxy-related test failure fun

1.3501    2019-03-14 19:19:49+00:00 Europe/London (TRIAL RELEASE)
[BUG FIXES]
Fix "too late to set cookie" errors if you access a session within an \ 
after hook
after using send_file().