Update
More consistent error messages, with failure explanation

and a little bit of housekeeping (tabs, etc)
Small fix for previous commit
GuessSeqFormat from non-seekable filehandles such as STDIN
Update and modernization of GuessSeqFormat tests
Small test fix
Checked that all testable formats are tested
Removed test data files that are not needed anymore
Restored test file for AlignIO
Fixed a typo
Reorganized guess() method of GuessSeqFormat
Updated number of tests
Fixed synopsis typo
Bio::SeqIO::new POD update
Mention -string parameter in POD
More POD clarifications
Removed mentions the ARGV and STDIN features

1/ their documentation was less than clear
2/ they seem to have been broken for quite some time
3/ tests disagree that STDIN should be used this way
Fixed missing detection of format in SeqIO when given a -string
Slight SeqIO::guess code flow change
Added autodetection of file format in Bio::SeqIO::MultiFile