use Array#compact method!
Revert "moved old scripts to prev dir"

This reverts commit d560458049e87354d85da6b29fa61a7c27368389.
Revert "use Array#compact method!" / cannot use compact for groonga::hash

This reverts commit 59c1d41f673617323115ad46ce0f6c6f803f7a7b.
moved old scripts ; again
fixed wrong spelling in _2.fastq
removing original sra file
changed not to conflict flushing files
fixed a bug, not using !~
just changed a bit for a test