start work on Prima.pm
oh, now I get it.  $is_twiddling is just a semaphore.  Not using it.
get rid of is_twiddling references
more documentation and notes
finally figured out multiplots on a single Plot object.
xrange, title, axis labels implemented
colors and plot holding work now.  (Line styles, not so much yet)
add log axes, line width, better style handling.  Also, move plot option setting *above* all the data adding, for better performance and no graphical blinking
add errorbar support
limit bars
tick off items
initial prima development - merging to master
Merge branch 'prima-devel'
remove prima from tests to not break master branch