Added showdebug command.
Also:
* Added an exported constructor to RChildProcess so the iProcess handle was set to zero on construction.
* Fixed bug in fshell_builddocs script that created HTML relative links with backslashes instead of forward slashes.
winscw \fshell\build\s60\3rd_edition winscw udeb
armv5 \fshell\build\s60\3rd_edition armv5 urel