Made global system error handler state part of Sieve instance.

src/lib-sieve-tool/sieve-tool.c

src/lib-sieve/plugins/include/ext-include-binary.c

src/lib-sieve/plugins/include/ext-include-common.c

src/lib-sieve/plugins/include/ext-include-variables.c

...ib-sieve/plugins/spamvirustest/ext-spamvirustest-common.c

src/lib-sieve/plugins/variables/ext-variables-common.c

src/lib-sieve/plugins/variables/sieve-ext-variables.h

src/lib-sieve/sieve-binary-file.c

src/lib-sieve/sieve-binary-private.h

src/lib-sieve/sieve-common.h

src/lib-sieve/sieve-error-private.h

src/lib-sieve/sieve-error.c

src/lib-sieve/sieve-error.h

src/lib-sieve/sieve-extensions.c

src/lib-sieve/sieve-message.c

src/lib-sieve/sieve-script.c

src/lib-sieve/sieve-settings.c

src/lib-sieve/sieve.c

src/lib-sieve/sieve.h

src/lib-sieve/tst-size.c