1. Added WITH_SPICE CMake variable. If it is not set usual Qucs will be
built. Application name is set to "qucs". If it is set, Qucs-S will be
built. Application name will be to "qucs-s".
2. Removed hardoced resources paths in "/usr/share/qucs", etc and
application names. Now resource paths depends on application name.
Resources will be installed into PREFIX/share/qucs-s/ for Qucs-S
3. Introduced a special definition QUCS_NAME in config.h. It will store
real application name.
4. Disabled default Debug mode for CMake
5. Exclude qucsattenuator, qucsedit, qucsresocdes, qucstrans, and qucshelp
(except docs) from the build system when building with WITH_SPICE switch
