switch to new dtkDistributed layer in new composer, to be continued.
backport fix for loops and blocks in scene node editor
temporary disabling of node Spawn compilation; fix return type of Work
add composer evaluator tool
disable compilation of nodeDistributed (temporary)
distributed support: fix typo in cmake in headers file list.
use $CMAKE_INSTALL_LIBDIR var instead of 'lib'
use $CMAKE_INSTALL_LIBDIR var instead of 'lib'