[Genome] Bug report: netToAxt

[Tomas Vinar]

netToAxt does not close the .nib files that were already used and if
there are many of them (e.g., genome in many contigs), it exceeds
limit of open files and dies.

workaround: use .2bit instead of .nib

-- 
--------------------------------------------------------------------------
Tomas Vinar, Postdoctoral Researcher
Biological Statistics and Computational Biology
Cornell University
E-mail: tv35 at cornell.edu
Office: 169 Biotechnology Building
Work Phone: +1-607-255-7430