Handles default authoring differently.

*) Using the same method to author as for when first file is deliberately cut
as default method seems to produce better results and less errors.

Default still not changed in dvd.tc.sh and this is a workaround to enable
further testing but the workaround is mainly also a permanent change of the
logic (see below),just the default for ISO project will be changed. I.e.
this will not be reverted whence testing is over and if/when change is also
implemented in dvd.tc.sh

*) Both ISO and VOB project can now handle explicit defaults for dvd.tc.sh
and handling logic is identical for both. This is good as it will make it
easier to pass defaults via command-line when the UI is added.

Change-Id: I18e42759f5edfbcc4c77732180976cec47def2de
Bugfix: Name pattern was not permissive enough.

Also) Omit settings for subs when authoring as it seems to generate errors
in some cases. Subs are not used anyway and quite likely all handling of
subs will be removed soon.

Change-Id: Ie332ee45c93a01d197374d9d6d8ec2f24dad73b0