GXemul Code2

Updating some notes on supported platforms, and how/where development is done.

Fixing flawed mymkstemp by also passing O_CREAT | O_EXCL (used on systems without mkstemp) (reported as Debian bug #574537). I have tested it on an Ubuntu machine; it enables Linux users of gxemul to use e.g. the -j command line option (which did not work before).

Minor documentation updates.

Updating doc/translation.html with more examples on how the dyntrans system works (in pre-0.6.x and in 0.6.x).

Only do heavy dyntrans page ValidateConsistency() in debug builds.

More TODO updates.

increase_refcount, decrease_refcount, and release() should be non-public.

Updating TODO about instabilities in the cycle scheduling mechanism.

Adding flush() calls to stderr and stdout, in an attempt to improve clarity in test output during failures.

Scrapping the "plugin" concept; the already existing component framework should hopefully be enough as it is.