K 10 svn:author V 2 dg K 8 svn:date V 27 1996-06-20T01:55:54.000000Z K 7 svn:log V 237 Brought in the rewritten versions of vmapbuf/vunmapbuf from main branch. Not only is the code higher quality, but it also fixes a rounding/off-by- one bug that caused a panic when doing physio() with DIAGNOSTIC. This fix closes PR#1195. END