GXemul Code2

Adding command line options -L and -l, to call the legacy
-H and -h help, respectively.
If an unknown template name is supplied to the -e option,
the legacy old_main is called with the entire command line.

Fixing spelling mistake (GTKMM -> GLIBMM).

Beginning on a M88K_CPUComponent class.

Minor update.

Adding a mini-howto on how to add components to the framework.

Include some more headers so that the code compiles with GCC/G++ 4.4 20090102.

Clarify what it means to not be cycle-accurate.

Removing the -E machine selection option. -e is the only one that should be used.

memory -> %memory, so that Doxygen does not make links to the memory struct.

Minor clarification of debug vs non-debug vs release.