add message handler for qDebug, qWarning, ...

On Windows these are not printed to the terminal. Hard to see what is going on.
http://qt-project.org/doc/qt-4.8/debug.html#warning-and-debugging-messages

Use the DebugView tool on windows to see the debug messages.
add PATH to library builder process

minor cleanup
fix messabox title
add comments, todo
only pass loaded modules used on the netlist

Avoid passing modules/symbols that could be loaded but not in use on the
given schematic.
add docks to hold messages from adms and compiler

The message docks show the output of the makefiles run during the
build of the Verilog-A dynamic libraries.