Purpose is to allow procedures in sources to be compiled as separate modules with
public linkage or as privately included with minimal overhead for changing desired
linkage.

- set default procedure linkage with
  '#pragma private [=value]' or
  '#pragma push( private [,value] )'

- #pragma private
- #pragma private = true
- #pragma private = false
- #pragma push( private )
- #pragma push( private, true )
- #pragma push( private, false )
- #pragma pop( private )