Cleaned bash functions with a "return" statement
Added docstring and refactored return values for all bash functions

All functions have now docstring (except launch_config_assistant, deleted in #73).
The return values have been refactored: each error returns is own error code instead of the sub-command error code.
Refactored variable contents in the bash function "create_cr_user" (#69)
Updated bash docstrings

(spelling fixes)
Updated NEWS for #74 (Bash function cleaned)
Merge remote-tracking branch 'origin/develop' into clean-bash

Conflicts:
	NEWS
	bash/functions.inc.sh
Merge pull request #74 from CentralReport/clean-bash

Cleaned bash code. Solves #68 and #69.