Testsuite: added final existing error tests.

sieve/errors/address-errors.sieve

sieve/errors/address-part-errors.sieve

sieve/errors/encoded-character.sieve

sieve/errors/envelope-errors.sieve

sieve/errors/header-errors.sieve

sieve/errors/if-errors.sieve

sieve/errors/interesting.sieve

sieve/errors/keep-errors.sieve

sieve/errors/parse-errors.sieve

sieve/errors/require-errors.sieve

sieve/errors/size-errors.sieve

sieve/errors/stop-errors.sieve

sieve/errors/tag-errors.sieve

tests/compile/errors.svtest

tests/compile/errors/out-address.sieve

tests/compile/errors/tag.sieve