GXemul Code2

Include HTML link to machine templates (not just other components), from generated trees.

Man page reflects September 2010.

Improved the "pretty print" of components in the tree dump, by moving it out to a per-component virtual function.

Overwrite memory with nonsense on free().

Updating the OpenBSD/landisk guest operating system install instructions from 4.6 to 4.7.

HISTORY comment for r5734.

Adding a hack for outputting raw .ppm dumps of framebuffer contents. Useful for e.g. making movies of GXemul runs.

nbjoerg on #GXemul (FreeNode) noticed an easy way to trigger an unhandled case in memory_sh.cc. Hopefully this is the correct solution.

Use exit(0) instead of exit(1), per Andreas Ehliar's recommendation.

Remove callgrind and cachegrind output files on make clean, and adding a comment about using valgrind to the configure script.