Initial commit.
Added handling of watches, after receiving a setwatch command through the socket (handleclientmessage, watches).
Handling changes when they occur on watch (watches, changestate).
Added fschangenotify to watch a fs object (file or directory).
Added fsnotify call.
Simplify the logging, make use of static parameter per source file:

path-resolution.c
simpleoverlayfs.c
options.c
fschangenotify.c
entry-management.c