Changed argument to operand processing to be much more flexible.

src/lib-sieve/ext-envelope.c

src/lib-sieve/ext-fileinto.c

src/lib-sieve/ext-reject.c

src/lib-sieve/plugins/vacation/ext-vacation.c

src/lib-sieve/sieve-binary.h

src/lib-sieve/sieve-code.c

src/lib-sieve/sieve-code.h

src/lib-sieve/sieve-commands.c

src/lib-sieve/sieve-commands.h

src/lib-sieve/sieve-generator.c

src/lib-sieve/sieve-generator.h

src/lib-sieve/sieve-interpreter.c

src/lib-sieve/sieve-validator.c

src/lib-sieve/sieve-validator.h

src/lib-sieve/tst-address.c

src/lib-sieve/tst-exists.c

src/lib-sieve/tst-header.c

src/lib-sieve/tst-size.c