Add random library.

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+This library is licensed under the GNU AFFERO GENERAL PUBLIC LICENSE. The
+license text can be found in the top-level LICENSE file of this project.
+
+This library makes use of third-party software. The licenses for this
+third-party software are listed below.
+
+# mt19937-64.c
+
+A C-program for MT19937-64 (2004/9/29 version).
+Coded by Takuji Nishimura and Makoto Matsumoto.
+
+This is a 64-bit version of Mersenne Twister pseudorandom number
+generator.
+
+Before using, initialize the state by using init_genrand64(seed)
+or init_by_array64(init_key, key_length).
+
+Copyright (C) 2004, Makoto Matsumoto and Takuji Nishimura,
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+3. The names of its contributors may not be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+References:
+T. Nishimura, ``Tables of 64-bit Mersenne Twisters''
+ACM Transactions on Modeling and
+Computer Simulation 10. (2000) 348--357.
+M. Matsumoto and T. Nishimura,
+``Mersenne Twister: a 623-dimensionally equidistributed
+  uniform pseudorandom number generator''
+ACM Transactions on Modeling and
+Computer Simulation 8. (Jan. 1998) 3--30.
+
+Any feedback is very welcome.
+http://www.math.hiroshima-u.ac.jp/~m-mat/MT/emt.html
+email: m-mat @ math.sci.hiroshima-u.ac.jp (remove spaces)