Summary of important user-visible changes for nurbs 1.3.8:
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 * inst/nrbexport: export multipatch geometries

Summary of important user-visible changes for nurbs 1.3.8:
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 * inst/nrbkntremove.m: added new function

 * inst/nrbunclamp.m: added new function

 * inst/nrbmak.m: adapted for unclamped knot vector

 * inst/nrbplot.m: adapted for unclamped knot vector

 * inst/nrbkntplot.m: adapted for unclamped knot vector

 * inst/nrb2iges: added new function

 * inst/nrbmultipatch: added new function

Summary of important user-visible changes for nurbs 1.3.7:
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 ** 1.3.7 is mainly a maintainance release to distribute small bug fixes 
    that accumulated over time.

 * inst/nrbpermute.m: added new function

 * inst/nrbreverse.m: each direction can now be reversed independently

 * inst/nrbkntplot.m: now works for non-unitary interval

 * inst/nrbcrvderiveval: code vectorized 

 * inst/nrbplot: fixed bug in affecting plot of trivariate nurbs, now works for 
   non-unitary intervals 

 * inst/nrbctrplot.m: plot the points only once

 * src/*.cc: avoid use of deprecated array constructors