updated backw. layer and prepared 'fill between' lib
renamed fill between library
Improved docs for box plots 'draw position'
worked on fill-between
added UT expectation
worked on fill between
fill between lib: updated bounding box correctly
worked on fill between
fill between: added good default style and closed combined paths
code cleanup
added test files
added reference REV
worked on fill between
updated todo
improved inline docs
	- improved auto-detection of correct output colorspaces from xcolor
updated todo
fixed incompatibility with \label and \usepackage{mcaption}
added regression test
fill between: added support of 'split=true' and auto-reversal