https://bugs.eclipse.org/bugs/show_bug.cgi?id=493058

Totally spaced the fact that WID parameters can be mapped from process
variables :( This fix creates read-only text fields with a button that
pops up a selection dialog for Property/Expression, similar to I/O
Parameters tab detail.

Also fixed a startup issue where Custom Tasks table was not created
before it was referenced during file loading.

Also fixed a bug in IoParameterMappingColumn.
9 files changed