Use the same default scalac options in all three partest frontends

Make ConsoleRunner, AntRunner and SBTRunner take scalac options from
"partest.scalac_opts" property.

Also remove leftover "-deprecation" option from test/partest.

The change to SBTRunner was not tested as sbt test is currently broken.
Merge pull request #1949 from khernyo/partest-scalac-opts-fix

Use the same default scalac options in all three partest frontends