in FLAC tester, process til end-of-stream before seek barrage, to make sure the decoder can still seek while in the EOS state

merge down from merged-API-layer branch: cvs -q up -dP -j API_LAYER_MERGING_BASELINE -j API_LAYER_MERGING_BRANCH

MD5 comparison failures on decoding are now an error instead of a warning and will also return a non-zero exit code (SF #1493725).

change unparseable frame handling, from a fatal error and FLAC__STREAM_DECODER_UNPARSEABLE_STREAM state, to a soft error FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM; also fixup wave/aiff headers when -F and there is no STREAMINFO

change unparseable frame handling, from a fatal error and FLAC__STREAM_DECODER_UNPARSEABLE_STREAM state, to a soft error FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM

add --disable-xmms-plugin option to prevent building the xmms plugin (sf#930494 https://sourceforge.net/tracker/index.php?func=detail&aid=930494&group_id=13478&atid=363478)

add configure options --disable-thorough-tests which breaks up testing into 3 levels: 0 for basic testing, 1 for thorough testing, 2 for exhaustive testing

use flac file name instead of dummy.wav for --export-cuesheet-to (sf request #1272825 https://sourceforge.net/tracker/index.php?func=detail&aid=1272825&group_id=13478&atid=363478)

add --disable-doxygen-docs options (sf patch #1365935 https://sourceforge.net/tracker/index.php?func=detail&aid=1365935&group_id=13478&atid=313478)