Configuration: simplified commented namelist settings at the end of a group by adding a special variable '.end'

Namelist groups may be disabled by setting the special variable '.hide' to 'true'. This allows to selectively re-enable groups in higher order config files by setting '.hide' to 'false'

Configuration: changed handling of remove lists to not remove the .remove entries from config; used to break handling of remove lists in standalone calls to format_namelist

mkexp: changed 'get_file' function to return unknown variable references unchanged, added 'get_dir' function, returning the path for a given 'files' section

mkexp: changed 'list' filter replacement to map the empty string to an empty list. Added option to keep empty string as singleton list if needed

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

Disabled evaluation of standard Jinja blocks ({% ... %}) and comments ({# ... #}). This allows handling templates with standard Jinja code and shell scripts using array length expansion (${#ARRAY})

* First look for templates based on the config file's base name
* Then look for templates based on the given EXP_ID

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

* Added 'raw(...)' expression to allow unquoted namelist expressions
* Added 'set' test to reliably check if namelist switches are true
* 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

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 traversal (walk) function to parse keys and values for verbatim target variables, i.e. variables of the generated script language
* Added environment functions to temporarily reset the string used for new lines. Needed to work around the missing 'wrapstring' keyword in Jinja 2.6
* Added context function to allow querying context variables by name within templates. Needed to get default values for target variables.

Added configurable variable format to namelist values. Variables $${x} are now recognized as script native variables. Defining .var_format allows different script syntax, e.g. XML style (.var_format = <%s>)

Fixed override behaviour for global job config: now specialized job config will always override global job config

* 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'.