Document the "#if (defined(__unix__) || defined(unix))" way of including sys/param.h.  Change _HAVE_PARAM_H to "HAVE_SYS_PARAM_H" for those who still like this method -- leading underscores are in the compiler/library name space and the Ollivier says to follow GNU Autoconf anyway.
Document the "#if (defined(__unix__) || defined(unix))" way of including
sys/param.h.  Change _HAVE_PARAM_H to "HAVE_SYS_PARAM_H" for those who
still like this method -- leading underscores are in the compiler/library
name space and the Ollivier says to follow GNU Autoconf anyway.

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