Added a check for the webserver port availability

A function in the new "web" module checks if a port is used (on the local or a remote computer). In this case, the webserver is not loaded and an error is written in logs.
Updated NEWS with the "port check" improvement
Spelling fixes
Merge remote-tracking branch 'origin/develop' into feature-port-check

Conflicts:
	NEWS
Merge pull request #72 from CentralReport/feature-port-check

Added a check for the webserver port availability

For the issue #65.