fix bug where decoding to stdout could fail for no good reason in some cases; fixes from MSVC compile

multifix: change FLAC__stream_encoder_finish() to also return false if there is an error processing the last frame or updating metadata

multifix: change FLAC__stream_encoder_finish() to also return false if there is an error processing the last frame or updating metadata; fix problem trying to update metadata when encoding to stdout; fix problem with updating metadata if client seek_callback returns UNSUPPORTED

add argument to test_seeking to accept #samples in the input, to better evaluate whether or not seeking near/past end-of-stream

fix bug with -S # where the sample number >= total samples, is not getting converted to a placeholder point

fix a bug where missing STREAMINFO fields (min/max framesize, total samples, MD5 sum) and seek point offsets were not getting rewritten back to Ogg FLAC file (SF#1338969 https://sourceforge.net/tracker/index.php?func=detail&aid=1338969&group_id=13478&atid=113478)

disallow multiple input FLAC files when --import-tags-from=- is used (SF#1082577 http://sourceforge.net/tracker/index.php?func=detail&aid=1082577&group_id=13478&atid=113478)

disallow multiple input FLAC files when --import-tags-from=- is used (SF#1082577 http://sourceforge.net/tracker/index.php?func=detail&aid=1082577&group_id=13478&atid=113478)

increase progress report rate with -p and -e used together (SF#1580122: http://sourceforge.net/tracker/index.php?func=detail&aid=1580122&group_id=13478&atid=113478)

fix bug where sync error at end-of-stream was not being caught (SF#1244071 https://sourceforge.net/tracker/index.php?func=detail&aid=1244071&group_id=13478&atid=113478); add warning about not being able to check md5 if md5 sum in STREAMINFO is zero

compile fixes based on patch (SF#913238 http://sourceforge.net/tracker/index.php?func=detail&aid=913238&group_id=13478&atid=113478