Implemented required features for use with MANAGESIEVE service.

src/lib-sieve/Makefile.am

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

src/lib-sieve/sieve-binary.c

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

src/lib-sieve/sieve-error.c

src/lib-sieve/sieve-error.h

src/lib-sieve/sieve-generator.c

src/lib-sieve/sieve-interpreter.c

src/lib-sieve/sieve-lexer.c

src/lib-sieve/sieve-parser.c

src/lib-sieve/sieve-result.c

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

src/lib-sieve/sieve-script.c

src/lib-sieve/sieve-script.h

src/lib-sieve/sieve-validator.c

src/lib-sieve/sieve.c

src/lib-sieve/sieve.h

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

src/sieve-bin/bin-common.c

src/sieve-bin/sieve-exec.c