templates/mercury/Makefile.tmpl: add clean + runtests-verbose targets
templates/mercury/tests/.gitignore: ignoring tests temporary files
src/templates/mercury/results.{cmd,sh}: add -v/--verbose flag
mmcmake.cmd: replacing \ with /, such that the pathes can be used in /bin/sh
src/templates/mercury/tests/Makefile: supporting complex test cases