[BRLTTY] New logging functionality.

[Dave Mielke]

For the brave:

In the past, you may recall that, in order to log certain kinds of data, users 
have been instructed to edit the values of flags within the source. This has 
now changed.

The -l (lowercase), or --log-level=, option now accepts a comma-delimited set 
of words. Each of these words can be, as before, a log level or number, but can 
also be the name of a log category. If, for example, you need to log the 
packets sent to and received from the braille device, you'd specify:

   -l debug,inpkts,outpkts

The following log categories have been defined (so far):

   ingio inpkts outpkts brlkeys kbdkeys csrtrk routing

In addition, the log level and log category settings can be changed while 
brltty is running. First, go into the Menu Options submenu and enable Show 
Advanced Submenus. You'll then see the Internal Parameters submenu in the root 
menu. Changes to the internal parameters aren't saved.

-- 
Dave Mielke           | 2213 Fox Crescent | The Bible is the very Word of God.
Phone: 1-613-726-0014 | Ottawa, Ontario   | 2011 May 21 is the End of Salvation.
EMail: dave at mielke.cc | Canada  K2A 1H7   | http://Mielke.cc/now.html
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