Added a test of the snprintf function provided by the trio library

    * configure: Regenerated
    * configure.ac: Added trio-snprintf benchmark
    * src/trio-snprintf/Makefile.am: Makefile.am for trio-snprintf
    * src/trio-snprintf/Makefile.in: Regenerated
    * src/trio-snprintf/trio.c: Main library file for trio
    * src/trio-snprintf/trio.h: Main header for trio
    * src/trio-snprintf/trio_test.c: Benchmark test file for trio-
        snprintf
    * src/trio-snprintf/triodef.h: Part of trio library
    * src/trio-snprintf/triop.h: Part of trio library
    * src/trio-snprintf/triostr.c: Part of trio library
    * src/trio-snprintf/triostr.h: Part of trio library