update build instructions

increase version number to 3.1

fix #318 - incorrect link to ucx 3 docs

fix incorrect documentation of cxBufferEof()

fix wrong static lib name in check target

add update-rules script

add an uwproj based install target

replace most of the build system with uwproj

make C++ compiler and pandoc entirely optional

Release 3.0

update CHANGELOG, COPYING, and README v3.0

Release Version 3.0

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