mutr 0.0.2

added TEST_NOT_ERROR to check that the expression doesn't throw error
fixed incorrect assignment of call within TEST and TEST_ERROR
enhanced self-testing TEST__PASS and TEST__FAIL to preserve the expression
TEST__PASS and TEST__FAIL now can accept optional arguments
added more self-tests.
added versioning and NEWS.md
removed old files (some functionality now in the mpd package
a simple makefile for self-testing and to copy mutr.r into examples

mutr 0.0.1

initial version