added a specific SMT exception captured by smt_tac (prevents the SMT method from failing with an exception),
replaced unspecific 'error' invocations with raising of specific SMT exceptions,
added annotations to traced SMT problem and solver output
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cd41a57221d07441647284e239b8d8d77d498ef5 isa94
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fc385ce6187d5ad2cef90f1e6240cc691e02d827 Isabelle2005
5c8618f95d240046bbbb609b643c06704888f587 Isabelle2009