Mon 6 Feb 2017 : added method to get solution and its corresponding t value
  to polysol.h and polysol.ttp.

Sat 28 Jan 2017 : templated the test function in test_poly.cpp.
  Added templated code for the solutions in polysol.h, polysol.tpp,
  fixed bug in utilities.h, utilities.tpp, with the test_polysol.cpp,
  and its compilation instructions in the makefile.

Thu 26 Jan 2017 : some improvements in the documentation of poly.h.
  Guarded a delete statement with a test if NULL in poly.h.

Tue 24 Jan 2017 : renamed the template type T1 into RealType in poly.h,
  poly.tpp, utilities.h, and utilities.tpp.
