Tidying up

* Fixed compiler warnings about potentially uninitialised variables (build now warning free on my system).
* Fixed potential bug in populate_root_dir() error handling. Error handling is still quite messy though.
* Tidied up some broken indenting.
* Have error about missing getline/fgetln in one place only.
* Tidying up usage a bit.
* Tidying up and extending README file to cover new features.
* Renamed sshnet to afuse-avahissh.
Modified AUTHORS file to indicate original author + current lead developer.