disc-trigger: Remove old disc-trigger scripts ready for newly decoupled pair
disc-trg*: Add newly decoupled pair of scripts

Based heavily on the single disc-trigger script this new pair simply
decoule the rip stage from the encode stage resulting in a ripper that
can just continuously feed a queue that the encoder processes until
there is no more work available.
disc-trg*: Move common check_fs() function definition into config file

Both scripts make use of this
Makefile: Install new scripts, not old
dsc-trg: Rename disc-trg- to drop the 'i' for an even shorter command
75-optical-drive.rules: Update rules to call newly renamed script
dsc-trg-q-epilogue: Join the two scripts together

Start a queue runner from the ripper, if one is not already running
dsc-trg.conf: Bug fix - name duplication in prologue/epilogue
dsc-trg-q: Export these for the subshell
dsc-trg-q: Functions can't be aliased, assign to a variable
dsc-trg-q: Revert to older code
dsc-trg-dq: Bug fix - forgotten older 'q' variable
dsc-trg-dq: Bug fix - substitution incorrect
dsc-trg-dq: Attempt alternative for/while loop for main queue driver

Still unsure why bash  has these isssues - passing 1 variable with
carriage returns contained within instead of delimiting on whitespace
like it should.
blutit: Provide alternative printing format for verbose mode
blutit: Bug fix - constant assignment of final title as preferred!
blutit: Introduce new detect_episodes() function

Eventually this will be able to detect a set of TV series episodes;

By calculating the average duration and then the standard deviation
from that mean, we can identify all titles that have a duration of
that average +/- the standard deviation. All that fall into this category
are likely to be episodes from the same TV series as typically when aired
they are the same length.
blutit: Store the 'raw' duration and size of a title
blutit: Use the 'raw' duration of a title for the mean
blutit: Finish detect_episodes() moving mean/stdev into their own functions

Should return a subset of those titles that fit within the range