Improve export generation.

pkgutil.pas:
  + new function exportprocsym to correctly export a procedure with all its aliases
  + new function exportabstractrecordsymproc to export the members of structured types 
  * insert_export: handle also namespacesym and propertsym (by ignoring them)
  * insert_export: correctly export classes, record and objects
  * insert_export: use new exportprocsym function to export a procsym
  * insert_export: only export public variables of a static symtable



git-svn-id: http://svn.freepascal.org/svn/fpc/branches/svenbarth@28844 3ad0048d-3df7-0310-abae-a5850022a9f2
+ add entry constants for the name of the package and the package file names, both used by a PCP file

git-svn-id: http://svn.freepascal.org/svn/fpc/branches/svenbarth@28845 3ad0048d-3df7-0310-abae-a5850022a9f2