Closes #317
Target not set in Unix makefiles.
Merge remote-tracking branch 'origin/master'
Ignore python external.
SCIRun smart pointer type no longer uses ref_cnt.
Set up cached variable for log4cpp library name to ensure correct library name is used in Debug builds.
There seems to be a log4cpp parsing bug on OS X 10.7, where even the default pattern specified in the log4cpp::PatternLayout class is failing. This is a preliminary attempt to report and recover, allowing the GUI to start up.
Merge remote-tracking branch 'origin/master' into pythonExternalIntegration
Build is complaining about missing symbols from log4cpp.