adding customer access to webserver logs. fixing #908 and #984

Logs are now created under /var/customer/logs/LOGINNAME/LOGINNAME-access.log etc.

FTP username is "LOGINNAME_logs". Password is same as for main ftp account.

Its not possible to delete and edit the logfiles or to add new files to the log directory because its owned by the webserver user which is configured in the panel settings table of the froxlor db...

Customer can only view the log files.

Also fixes bug 984.