some updates to slave buffer mode
extempore.el: bugfix for cursor following in slave mode
extempore.el: more updates to slave buffer mode

these changes fix up the 'point following' functionality
they also allow the major mode to be triggered automatically
xtm.xtm should set the xtmlib symbols for all audio libs
big update to slave buffer stuff

rename extempore-slave-buffer prefix to 'esb'
'cursor following' should be more robust
nicer print for audio init
extempore.el: more updates to slave buffer mode

rename esb -> extempore-sb

add extempore-sb-toggle-current-buffer

add keybindings for starting the server and pushing the current buffer

change refresh interval to 0.5 sec
added path expansion: sys:expand-path
improvements to make-tags.sh
a few more updates to extempore.el

fix a few of the warnings given by byte-compile-file
extempore.el: add eval 'blinks' to slave buffers
updates to extempore.el to get it to byte-compile
extempore.el: allow eval 'blinking' face to use a background attribute
extempore.el: blink slave buffer evals in a different colour
small tweak to 'eval blinking' in emacs
another bugfix for extempore.el
extempore.el: change blink duration from 0.3 to 0.2 sec
change default port for extempore-sb slave buffer server to 8420
freq cutoff test in playnote to high
update to slave buffer to make syncing of large buffers more robust