Changes for version 0.003 - 2019-08-17
- Added support for __DATA__ tags in package namespaces other than main (BOFTX).
- Adapted orginal test script for Sys::RunAlone and added new tests for additional functionality (BOFTX).
- [doc] Added clarification for __DATA__ vs __END__ in different namespaces (BOFTX).
- Sys::RunAlone::Flexible - make sure only one invocation of a script is active at a time