Improved byte code dumping to be more readable.

TODO

src/lib-sieve/cmd-redirect.c

src/lib-sieve/ext-envelope.c

src/lib-sieve/ext-fileinto.c

src/lib-sieve/ext-reject.c

src/lib-sieve/mcht-is.c

src/lib-sieve/plugins/body/tst-body.c

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

src/lib-sieve/plugins/imapflags/tag-flags.c

src/lib-sieve/plugins/imapflags/tst-hasflag.c

src/lib-sieve/plugins/include/cmd-include.c

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

src/lib-sieve/plugins/variables/cmd-set.c

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

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

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

src/lib-sieve/plugins/variables/tst-string.c

src/lib-sieve/sieve-address-parts.c

src/lib-sieve/sieve-code-dumper.c

src/lib-sieve/sieve-code.c