vct.nodes: wqAdded FKIE nodes
Remove references to unused `configs` directory.
Replace hardwired reference to x86 target in README.
Replace hardwired x86 with TARGET variable.
Fix typo and add missing years in copyright notice.
Use alphabetically sortable timestamp based on UTC time.
Remove unneeded `|| true` constructs after `rm -f` commands.

This also allows to detect real errors like trying to remove a file with
insufficient permissions.
Assign default empty value for PROFILE.
Remove unused and undocumented BRANCH_GIT and REV_GIT argument variables.
Use autoconf-like file name and substitution format for feeds input file.
Rename variable for make source command options.
Provide default value and comment for BUILD_NUMBER.
Insert hyphen into timestamp as used by David Dahlberg.
Add comment on the need of a PROFILE.
Restore BRANCH_GIT and REV_GIT and add a comment on them.
Comment the presence of disabled configuration options.
Now target ``all`` simply depends on ``target`` (they did exactly the same).
Remove reference to missing argument to ``update_feeds``.
Add OpenWrt and OpenWrt package repos as submodules.
Do not ignore submodule directories.