Changed script generation to allow suppressing of default jobs by 'remove' keyword in 'jobs' section

Changed script generation to allow easier namelist setup (helper variables in namelists, evaluation of lists as strings; see EaSyMS13 IssueID #3621)

* Changed to support list valued expressions
* Changed to support expressions in lists

* Removed unused scripts
* Fixed module loading
* Anonymized default settings

* Renamed 'queue_settings' to 'environment'
* Changed to allow overriding environment by command line settings
* Added file system layout for blizzard and thunder to environment
* Fixed partition name for thunder

* Added evaluation of expressions (eval(...))
* Re-wrote splitting of date strings (now uses split_date(...))

* Added missing version keywords in scripts and modules
* Updated some of the header comments

* Added handling of experiment description
** Initial comment is parsed if no EXP_DESCRIPTION is set
** Description is written to script directory as README file
* Added setting of top-level settings from command line

* Updated Makefile

* Changed directories to be fully configurable by default config
* Added tools for diff, printing, removal of experiment/script data

* Changed directories to be fully configurable by default config
* Added tools for diff, printing, removal of experiment/script data

* Added error handling for interpolation of configuration values
* Changed command line error to use logging interface
* Reduced verbosity of template defaulting

* Change misnamed EXPNAME keyword to EXP_TYPE

* Updated and extended example configurations

* Renamed default files from 'exp.*' to 'DEFAULT.*'

* Updated default template according to r2975, r2976

* Changed queue settings to be named after the target server
* Currently blizzard and thunder are supported

* Changed all namelist fields to lower-case names
* Added directory for initial and boundary data as variable (INITIAL_DATA)
* Changed post-processing script to allow more than one run for error recovery
* Fixed copying of job<n> scripts to use new job names
* Adjusted default wall-clock times for model run and post processing

* Changed all namelist fields to lower-case names
* Added directory for initial and boundary data as variable (INITIAL_DATA)
* Changed post-processing script to allow more than one run for error recovery
* Fixed copying of job<n> scripts to use new job names
* Adjusted default wall-clock times for model run and post processing

* Added functionality to reformat date/time strings to 6-element lists

* Added python packaging information
* Changed mkexp to look for templates in current directory, not in installation
* Added Makefile as wrapper to python packaging (install)