[PD-dev] pd branch: multiple signal chains

[Thomas Grill]

Hi developers,
i've made a PD branch off devel_0_36 named tgrill which will receive all
changes that in have i mind for the next future but which will possibly not
please all developers/users. Futhermore i consider it even more experimental
than devel_0_36.

The first major change to the PD code is the splitting up of the global
signal chain into multiple chains (one for each root canvas and its
sub-canvases). In further steps this shall guarantee dsp-click-freeness
while opening new patchers.
It is also a necessary prerequisite for a poly~ object without a 1-block
signal delay.

greetings,
Thomas