[svn-r15348] Checking in a collection of bug fixes and added test code -- specifically:

1) Fix for failure to detect journaling in progress on HDF5 files which
   were not closed correctly.  Also associated test code.

   Note that this required addition of code to test for journaling in 
   progress and enable journaling at the end of H5F_flush().  In passing,
   I was able to get rid of the wacky code that queued journaling setup
   at cache creation time.

2) Test code for startup and shutdown of journaling on an open file.

3) Updates to start checking journal output against architype files
   instead of just generating architypes at test time.

   Note that per Quincey's request, I have checked in gziped versions
   of the architype files.  At some point, we will have to add code 
   to automatically unzip these files, but for the time being you will
   have to go to test/testfiles and "gunzip *.gz".  The journal tests
   will still pass if you don't, but you will get a warning about 
   missing test files.

4) Fixed bug in journal entry logging code that allowed a comment to 
   appear in the journal file before the journal file header. (Mike M,:
   Please review my fix to verify that I haven't clobbered anything.)

5) Additional test code.

Note that more test code would be a good idea, but this set of bug 
fixes should be enough to get us through the basic demo -- at least 
as far as the metadata cache is concerned.

Tested serial on Phoenix, and parallel on Kagiso.  Also, tested serial
on Linew just prior to some last minute minor edits.

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