Vbox LAB scripts improvement

This pull request fixes several issues (at least in my view):

Increase video memory to 9m - VBoxManage GUI complains and i hate to see complaints.
Reformat indents - move everything to tabs. Issue is probably caused by editor configs
Enable pagefusion only if host is also 64bit (besides GUEST) it is doubtful if it will come in effect if guest additions are not installed.
Use only the first hostonly interface in case there are more than one (as i do)
vrdeport option in VBoxHeadless seems to have been deprecated. Use VBoxManage to set the config and --vrde config to start it.

ocochard / BSDRP