Removed extraneous mapdevice_add_signal()
Use object_post()
Use new arguments for msig_reserve_instances(), remove default instance 0 if using instances (since it has no user context pointer and the id wasn't chosen by the user anyway.).
Update object names in pwm synth demo; added 3-instance slider demo.
Enable signal objects embedded inside a maxmsp poly~ object to use the poly~'s index for their instance id.
Merged master into instances5
Merge branch 'instances5'

Conflicts:
	test/pwm.maxpat
	test/pwm_inside.maxpat
Fixed bugs in list message processing and inter-object communication on load.