2007-09-16 Marcus Brinkmann <marcus@g10code.de>

• gpgex.cc (gpgex_t::QueryContextMenu): Implement popup menu

correctly, such that the explorer can clean up correctly (in the
file dialog).
(gpgex_t::GetCommandString): Implement help texts.
(start_help): New function.
(gpgex_t::InvokeCommand): Call start_help.

• Makefile.am (gpgex_LDADD): Add -loleaut32.