In releasetest.tcl, change the --dryrun option to work as it does in

In releasetest.tcl, change the --dryrun option to work as it does in
multitest.tcl of TH3.  Add the new --trace option that work like the --dryrun
option used to work.  Add the ability to specify additional configure-script
options in the Config array, and create configurations that use
--disable-shared and --disable-amalgamation for testing.

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