lilgp1.1 -Wall patches

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Legalese:

WARNING: Use these at your own risk.  No warrantee is expressed or
         implied.

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Overview:
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When compiling lilgp1.1 with gcc's -Wall option we get a number
of warnings (see below).  They are annoying.  So I have eliminated
them.


Installation:
------------

PLEASE READ ALL OF THE INDIVIDUAL PATCH NOTES BELOW BEFORE
APPLYING PATCHES!!!


Step 1:
Extract the patches in to your lilgp kernel directory.  For
example:
    mv lilgp1.1.Wall.patches.tar.bz2 lilgp1.1/1.1/kernel
    cd lilgp1.1/1.1/kernel
    bunzip2 -c lilgp1.1.Wall.patches.tar.bz2 | tar -xvf -

Step 2:
Apply the patches.  For example:
    for i in *patch; do patch < $i; done

That's all.  You're done!

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Individual patch notes:

Innocuous patches:
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Unused variables have been removed from the following files:
kernel/main.c
kernel/gp.c
kernel/ckpoint.c
kernel/params.c

Questionable patches:
--------------------
In "kernel/eval.c" the evaluate_tree_recurse() returns nothing,
when it should return a DATATYPE.  This seems to be a corner-case
bug, which should "never happen".  My solution is to make the
program terminate in this corner case.  This is probably not the
perfect solution, but I don't have the time to dig deeper.

In "kernel/ckpoint.c" there is a bug in the fprintf format string.
Taking out the inapplicable "l" directive has simply silenced the
warning.  The bug may still exist.

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gcc -Wall warnings suppressed by this patch:

../../kernel/main.c: In function `main':
../../kernel/main.c:58: warning: unused variable `param'
../../kernel/gp.c: In function `read_saved_individuals':
../../kernel/gp.c:892: warning: unused variable `k'
../../kernel/gp.c:892: warning: unused variable `j'
../../kernel/eval.c: In function `evaluate_tree_recurse':
../../kernel/eval.c:199: warning: control reaches end of non-void function
../../kernel/ephem.c: In function `enlarge_ephem_space':
../../kernel/ephem.c:118: warning: unused variable `p'
../../kernel/ckpoint.c: In function `read_checkpoint':
../../kernel/ckpoint.c:46: warning: unused variable `j'
../../kernel/ckpoint.c: In function `write_checkpoint':
../../kernel/ckpoint.c:193: warning: unused variable `j'
../../kernel/ckpoint.c: In function `read_population':
../../kernel/ckpoint.c:327: warning: unused variable `l'
../../kernel/ckpoint.c: In function `write_population':
../../kernel/ckpoint.c:560: warning: unused variable `j'
../../kernel/ckpoint.c: In function `write_individual':
../../kernel/ckpoint.c:592: warning: use of `l' length character with `f' type character
../../kernel/ckpoint.c:592: warning: use of `l' length character with `f' type character
../../kernel/ckpoint.c:592: warning: use of `l' length character with `f' type character
../../kernel/event.c: In function `event_string':
../../kernel/event.c:46: warning: implicit declaration of function `sprintf'
../../kernel/event.c:46: warning: int format, clock_t arg (arg 3)
../../kernel/params.c: In function `read_parameter_database':
../../kernel/params.c:267: warning: unused variable `value'
../../kernel/params.c:267: warning: unused variable `name'