Cothread 2.6 release

[<michael.abbott@diamond.ac.uk>]

I have just released version 2.6 of the cothread.catools Python Channel Access bindings, this can be downloaded from http://controls.diamond.ac.uk/downloads/python/cothread/

This release adds the following features over the previous 2.3 release:

* Implement Python 3 support. This is currently maintained as a separate branch in the git repository which is repeatedly rebased onto the main Python 2 development branch. 

* Use asynchronous Channel Access notification. This reduces the risk of losing channel access events and increases the carrying capacity of channel access. Note that camonitor callbacks are still delivered synchronously to users. 

* Fix Qt4 readline hook bug. 

* Fix OSX compatibility, broken in earler release. 

* Fix bug in EPICS epoch correction. 

* Add datetime property to values where appropriate. 

* Add support for explicit Unicode support in catools, and correspondingly, add support for bytes in Python 3. 

* Improve default event mask for camonitor. 

* Floating point state is now maintained per cothread.

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