lib-mail: Removed quoted_printable_decode*() quoted_printable_q_decode() was still left in quoted-printable.h, but maybe it should be moved to qp-decoder.c as well.

lib-mail: quoted_printable_decode*() now returns all newlines as CRLF. This is required by BINARY fetches, since the original data had CRLFs.

lib-mail: Detect errors in quoted-printable input.

Split quoted-printable parsing to q-p body parsing and "Q" header parsing. Fixed also several other issues in quoted-printable parsing to get it fully RFC compliant. --HG-- branch : HEAD

Changed .h ifdef/defines to use <NAME>_H format. --HG-- branch : HEAD

Naming style changes, finally got tired of most of the typedefs. Also the previous enum -> macro change reverted so that we don't use the highest bit anymore, that's incompatible with old indexes so they will be rebuilt. --HG-- branch : HEAD

Added buffer API. Point is to hide all buffer writing behind this API which verifies that nothing overflows. Much better than doing the same checks all around the code, even if it is slightly slower. Buffer reading is still mostly done directly, that isn't such a big security risk and I can't think of a reasonable API for it anyway. --HG-- branch : HEAD

SEARCH CHARSET now works properly with message bodies, and in general body searching works more correctly by decoding base64/qp data. Non-text MIME parts are currently not included in search, that could be made optional. Also the body is parsed separately for each keyword, that could be optimized. Changed base64_decode() behaviour so that it can accept non-base64 data as well, ie. line feeds etc. --HG-- branch : HEAD