Finished new settings handling, including debugging support.

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

src/lib-sieve-tool/sieve-tool.h

src/lib-sieve/sieve-settings.c

src/lib-sieve/sieve-settings.h

src/lib-sieve/sieve.c

src/lib-sieve/sieve.h

src/plugins/lda-sieve/lda-sieve-plugin.c

src/sieve-tools/sieve-filter.c

src/sieve-tools/sieve-test.c

src/sieve-tools/sievec.c

src/sieve-tools/sieved.c

src/testsuite/Makefile.am

src/testsuite/testsuite-common.c

src/testsuite/testsuite-script.c

src/testsuite/testsuite-settings.c

src/testsuite/testsuite-settings.h

src/testsuite/testsuite.c