Moved mantissa, experimental sources to branches.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/branches/MANTISSA@928257 13f79535-47bb-0310-9956-ffa450edef68
tree: cc816d5424f718c119028de7ce92a6dc759602bc
  1. LICENSE-2.0.txt
  2. NOTICE.txt
  3. src/
  4. tests-src/