Blender Git Loki

Fix for memleaks caused by un-freed Value instances, kudos to Kevin Dietrich!

These values are heap-allocated virtual classes, because general node code is
largely agnostic to data types. After adding values to a node (either as
default input values or per instance), care must be taken to free them when
the node type or instance is destroyed.

Merge branch 'master' into object_nodes

Reusable functions for copying a set of nodes and calculating node bounds.

Added an optional update callback for the configurable object node ID property.

'Make Group' operator (ctrl+g) to easily create a node group from selected nodes.

Use a unified list for simplifying socket identifiers and matching RNA struct types.

Fix compiler warning from illegal zero-initialization in C++0x.

ID.flag has been split to put runtime tags in a separate field (rB3fcf535d).

Merge branch 'master' into object_nodes

Conflicts:
source/blender/depsgraph/intern/depsgraph_build_nodes.cc
source/blender/depsgraph/intern/depsgraph_build_relations.cc

List existing node groups in 'Group' categories for easy instancing.

This includes polling by type and recursion level to ensure groups
are only added in appropriate tree types, and don't create cyclic
dependencies.

Poll node groups based on node tree datablocks rather than node instances.

There is a redundancy in the nodetree/node relationship, since each nodes
is part of exactly one node tree. This means we can test for either trees
or nodes to detect cycles, and because we usually poll for node trees
rather than nodes that would be the natural choice.

Automatically create a new node tree when making an object component node.

Create a default minimal node setup when creating new trees or groups.

Duplicate enum values lead to creating mesh instead of dupli sockets in node groups.

Fix for empty dupli list defaults, these must be neither NULL nor static.

Use dedicated functions for producing graphviz debug output.

This allows creating unoptimized node graph output dumps without
causing crashes, because the codegen step is not performed when
just producing debug output.

Added RNA function for debugging dupli bvm nodes.

Fix for node groups: operator for creating a new tree was hard-wired to geometry nodes.

Added missing bf_blenvm linking for blenderplayer.

Use dynamic socket lists for mesh and dupli output nodes for convenience.