ASCII matrices using the format used by operator<<.

to not redraw overlay lines correctly in certain cases involving non-default
zoom levels.

by Isaac Peterson.  The bug caused the program to deadlock if signal() or
broadcast() was called at exactly the same time a wait_or_timeout() funciton timed
out.

array2d type image (not the one that draws onto a GUI canvas object).  The bug
triggered whenever a perfectly horizontal or vertical line that extended
outside the image was drawn.  This has been fixed.

safety.

parallel_for_blocked()

rules as I recently added to the structural_svm_problem_threaded object.

when using the optimization tools.

were assigned to each other.

optimizer noticeably faster in some cases.

overhead.