eventHandler: fix directory-modification detection

Also add info messages.
add \section{} for all source files
remove spurious GHC extension
eventHandler: more specific info message
prog: add info message on watched files
add commentary and reformat long lines to fit nicely
update copyright year
add note about usage of 'sed' command
remove unused function 'cmdQuiet'
Option: remove unused option 'interval'
auca 0.1.0