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Now Vidjil may load .gz files.

When exception is thrown from constructor, the destructor is not called

operator<< for Sequence already outputs one. No need to add another one

When the Sequence contains quality information, it outputs a FASTQ rather than a FASTA.
This may be useful is one day we output FASTQ information (we never know, isn't it?)

An exception can be caught while an exit can't. Thus we can test it.
Moreover some consistency is introduced: Fasta and OnlineFasta will
throw a invalid_argument in case of problem with the input file
(either in opening or parsing it).

Corrects bug introduced by 59a1bcf6.

core/fasta.{h,cpp}: default constructor also takes extract_field and extract_separator, factorize constructors

Even if we start from an empty Fasta, we should remember these values.

The constructor now uses the add() method which, itself, relies on the >> operator which has been overloaded.
Unit tests added for the add() method.

That solves signed/unsigned compilation warnings.
This had no effect in practice but that makes the compiler happy.

Array was allocated at each call in next().
It is now free-ed when necessary

	* Refactored main vidjil.cpp (core/windows.cpp, core/windowExtractor.cpp)
	* Removed unused html output
	* Better json output (core/json.cpp)
	* Updated main stdout, with representative sequence for each clone
	* Updated parameters for FineSegmenter (delta_max) and dynprog (substition cost)
	* Bugs closed

	* New selection of representative read (core/read_chooser.cpp)
	* Faster spaced seed computation (core/tools.cpp)
	* New unit tests
	* Bugs closed

	* First public release