test/RunTests: handle vw crashes and other abnormal terminations.
test/RunTests: fix undefined var $status
vw-top-errors: new utility to uncover learning process biggest issues
test/RunTests: fix undefined $TestNo warning
test/RunTests: remove redundant '(' in error.
utl/vw-top-errors: fully automate multi-stage process; add summary by feature; apply abs() to weights to determine importance
utl/vw-top-errors: FINISH ME no longer needed
Merge pull request #294 from arielf/master

test/RunTests: handle vw crashes and other abnormal terminations.