Include compiler flags from system property when interpreting pragma

When interpreting the #partest pragma in check files, also look for
compiler flags that were provided using the partest.scalac_opts system
property. That is, for example, when running

    SCALAC_OPTS="-Ydelambdafy:method" test/partest test/files/...
version number for 1.0.1 release
bump version number to next snapshot
Merge pull request #22 from lrytz/pragma

Include compiler flags from system property when interpreting pragma