Also add initial and final dates as global variables

This reverts commit 5e9ef6e9.

* Added full access to all other job configs for every job
* Added overriding of global variables in jobs
* Added job settings to global variable list (same as 'JOB' section)
* Changed upcoming release from 1.1.2 to 1.2.0, using 1.2.0dev for now

* Added wrapper to use PYTHON environment variable in tests
* Added unicode comment to default test config
* Changed config objects to use locale encoding
* Changed to use byte buffers for config (re-)writing
* Added tests for unicode sensitive tools