Log Message:
Update to 10.5.4

Changelog:
10.5.4
   3.7 newlispdoc cleanup ";; *" regex

   New FFI ffi.h include directory in makefile_linux* when installing libffi

   Fix for last list element optimization in push, pop and pop-assoc when
   popping and inserting last element

   Accessing a deleted context will never hang but give an error message

   Some changes in nl-filesys.c for AIX and new makefile for AIX ILP32

   On Windows: a fix for correctly closing logfiles initiated by newlisp -l or
   newlisp -L and for closing files created by the HTTP PUT operation.

   Two sample 't-test' when variances are different (independent samples) with
   new syntax:
        (t-test <list-vector-A> <list-vector-B> <float-probabilty>)
   When <float-probabilty> is specified, an internal F-test for variance
   equality in data A and B is performed. If the probablity of F is
   smaller than <float-probabilty>, then Welch's variant of the t-test for
   independent samples is performed. Using 1.0 <float-probabilty>, Welch
   can be forced even when variances are not significantly different.

   One sample 't-test' using new syntax pattern:
        (t-test <list-vector-data> <float-value>)
   Gives the two-tailed probability that observed mean is differs from \ 
<float-value>
   Instead of sdev for second list-vector the standard error for the observed mean
   is reported.

   Some cleanup and changes in scripts (makefiles) for binary installers