Fixed a bug in obi cat when concatenating views with columns having different key sets, and a bug in obi ecotag generating badly formatted column comments

obi import: new option --preread to do a first readthrough of the dataset if it contains huge dictionaries for a much faster import.

Better disk space management when importing files (rewritten columns are deleted).

Fixed a bug when importing a file where the first entry would contain a dictionary with a single key

Added the 'obi' prefix in the bash history commands, and fixed a compilation issue with some versions of gcc.

New command: obi cat to concatenate views, and various inconsequential fixes.

Fixed a bug in ngsfilter when there is only one tag.

ecopcr: fixed and improved the options to keep nucleotides around the amplicon

ngsfilter sequence cutting fixed for unaligned reads and other minor bug fixes

ngsfilter tool fixed and improved

First beta release (version 3.0.0-beta1).