GXemul Code2

Use Hexadecimal base address output.

Explicit cast to allow building with GCC 2.95.4 20020320 on FreeBSD/Alpha 4.9.

Introduce a ToInteger(), in addition to ToString().

Better fix for not showing base-class-only components in help/documentation etc.

Do not list base-class components in the help, documentation etc, since they cannot be instanciated.

Unbreak build; the UNITTESTS(className) case is special (used in GXemul.cc).

Oops, MIPS PROM is of course at physical 0x1fc00000, not 0xffffffffbfc00000. :-)

Updating Doxygen class comment for MainbusComponent: child components should be MemoryMappedComponents.

Adding some TODOs about automated documentation generation.

Minor updates to the Doxygen class comment for MemoryMappedComponent, and to the Source code documentation Main Page.