review (S) for 6945219: minor SA fixes

[Tom Rodriguez]

http://cr.openjdk.java.net/~never/6945219

6945219: minor SA fixes
Reviewed-by:

These are some small SA improvements and fixes that I've collected.
It includes ignoring an error case when reading core that happens
regularly when reading 64 bit core files on linux, removing the use of
show() to avoid deprecation warnings, more fixes to class file
dumping, improved exception handling/reporting, adding field offsets
to the information dumped when describing the fields of a class,
allowing suppression of Assert.that, new commands for the command line
HSDB and fixes to the handling of history.  Tested by debugging
crashes with it.