build steps, revised error handling and code refactoring
whonix_shared/usr/lib/whonix/whonixcheck/help_uwt_tool: added apt-get.real detection
build-steps/1100_prepare-build-machine:
- use apt-cacher-ng to download build dependencies
- 99whonix-build-confold > 90whonix-build-confold
- improved error handling
- commented out chown --recursive "$USERNAME":"$USERNAME" /home/"$USERNAME"
build-steps: using http_proxy variable for setting up apt-cacher-ng as proxy for gdebi and grml-debootstrap; comment
build-steps/2600_export-vbox-vm:
- added --manifest (hashes which can be used to determine if the appliance components arrived intact)
- also added --manifest, --product, --vendor, --vendorurl, --version
- Not yet using: --producturl
Got ride of whonix_shared/usr/share/whonix/apt.conf.
Now using http_proxy to use apt-cacher-ng while using apt-get.