This is a follow-up of the Python 3 port.
The `message` field is no longer supported in standard exceptions.

Currently for lists only

Fixes long run times for extended jobs/namelist groups

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

mkexp: reading of EXP_DESCRIPTION from initial comment now also discards leading and trailing lines that only contain white space and comment characters

Changed calls to regular expression substitution and string formatting to be compatible with python-2.6

Added SETUP_OPTIONS support for push model configuration requirements into the option list (e.g. no_hamocc, if HAMOCC is disabled at build time)

* Changed handling of '.use_template' to allow use of arbitrary template names
* Fixed error message for missing or wrong options
* Fixed setting ENVIRONMENT to 'DEFAULT' if set to empty in SETUP.config (see IssueID #5808)
* Added 'match' filter, allowing to use regular expression matches
* Added missing tests for 'wordwrap' filter
* Re-wrote documentation on additional Jinja filters

* Changed VERSION_ variable in standard config to be optional, added info if missing
* Updated documentation
* Updated version info and change list

* Added function add_days to handle day offsets for namelist settings

* Changed split_date to also handle YYYYMMDD dates
* Added function add_years to handle year offsets for namelist settings

* Added README mode to 'getexp'
* Changed 'getexp' output from warning to info
* Added option to skip directory creation for config tests (--no-make-dirs/-m)
* Support for default configuration settings by model build (SETUP.config)
* Added User Guide

Changed handling of blank environment, fixed section handling on command line, cleaned up testing, added release changes

* Changed behavior if environment name is set but empty: now uses default instead of looking for '' environment
* Fixed command line handling: different variables in the same section are now all recognized (see IssueID #5501). The test cases are updated accordingly
* Re-organized test cases to group command line handling in its own class
* Added empty [namelists] section to test config, simplifying test writing
* Added CHANGES.txt for upcoming release 0.3.0, updated setup to 0.3.0dev

* Added new control variable 'EXP_OPTIONS', taking a list of config names. Options are taken from the new 'standard_options' subdirectory
* Added respective test and simplified test module

* Added setting of sectioned variables via command line, using '.' as section path separator and '..' for verbatim periods
* Added automated testing using Python's unittest library
* Disambiguated warning due to missing experiment configuration; now mentions 'experiment'. 

* Moved mvstream settings to default configuration
* Adapted examples accordingly and updated README and docs
* Changed blizzard setup to use /scratch for working, read account from .acct

Changed script generator to allow a path for config files and templates (MKEXP_PATH); directories are separated by colon.

* Changed job extension to also inherit job settings (used to inherit script only)
* Changed job extension to allow namelist overwriting per job
* Namelist overwriting requires copying of the configuration data; this should be revisited