OpenWFE 1.4.6 released

OpenWFE 1.4.6 comprises different efforts.

The first of them focused on the process definition language where the concept of variable substitution was generalized and is now allowing nested variable / field references. The notation features also the concept of 'look for value in field else in variable' and vice versa.

A command-line tool named 'validate-flow.sh' (.bat) has been created for early validation of a process definition, to eliminate errors that were until now only detected at runtime.

The last effort was put into making sure that droflo was usable in edit mode also when not running as a root webapplication.

Care has been taken so that these features appear as documented in the docbook documentation.