Fixed: nodebuilder % output would crash log system

GLBSP outputs the compression rate of the blockmap in percent (e.g. 51%)
and wxLog was trying to interpret this percent as a printf formater,
causing crashes.
Nodebuilder improvements

- Remember nodebuilder settings instead of forgetting them when
switching to another nodebuilder.
- Grab error output from nodebuilders and log it to the console (if
log_verbosity >= 3).
- Added GLVIS nodebuilder profile.
- Added feature to call GLVIS when building GL nodes.