make emacs mode work with ecl - suppress banner.
Use symbols for names of operator properties.
Fix issue 23.
adapt install notes for cygwin, send errors when running in emacs to /dev/null.
Better error checking in configure.
Improve coercion of types.
Really add bugs2008-ExportType.spad.
Allow calling type-valued functions.
Delete duplicate test file.
Misc cleanups.