charset: add alias 'ascii' for 'us-ascii'
message: log invalid charsets for text parts
xapian: don't try to reindex missing folders
windows: 3 extra codepages
charset: more aliases
dav: remove-resource must include EXPUNGE
dav: fixup
xapian: search high-bit phrases without stemming
mboxname: separate counters for different types of mailbox modseq
mailbox: always create a cstring when parsing dav stuff

Otherwise exactly 2^N long messages can segfault, joy
Revert "http_dav: replace '@' with '%40' in URLs"

This reverts commit da9b82cf7864aeac6f4888da9c1071892f62f349.

It turns out that it didn't fix the problem with Apple, and it seems to be
messing up Thunderbird.  What a crock.