Added spatstat stuff
added ij2spatstat
Needed for future work with the package
Added package description
New function to convert ijzip and ijroi to spatstat
Added ELLIPSE, line, ARROW, freehand. Expanded help sheets. Added examples
Added strSubtype (needed for plot.ijroi). Corrected $xrange and $yrange. Now they come right way around.
Fixed bugs in print.all = FALSE elements. Now most ROI types should plot correctly.
Added new ImageJ ROI types.
Helpsheet for the new function
See commit messages for the corresponding functions
These are scrap files. Can't remember how to delete them.
Merge branch 'Largh-master'
Revert "These are scrap files. Can't remember how to delete them."

This reverts commit 5498a8e081f685a45909ab0b5a153f460679661a.
Added RImageJROI.Rproj to fix check --as-cran
Tidy up logic from commit a375ec783
Tidied indentation
Removed some cruft
argument print.all -> read.all
Moved functionality of print.all/read.all to new print function