Error handling with backtrace works (first workaround, based on Luca
Borrione code, see
http://stackoverflow.com/questions/64786/error-handling-in-bash).
Revert "Error handling with backtrace works (first workaround, based on
Luca Borrione code, see
http://stackoverflow.com/questions/64786/error-handling-in-bash)."

This reverts commit fc347c4415e3c57bfed7a9b978ec211305a77ef8.
Error handling with backtrace works (first workaround, based on Luca
Borrione code, see
http://stackoverflow.com/questions/64786/error-handling-in-bash). Added
a few lines of code to support log files. TODO : terminate log files
handling and beginning config file parsers.