add extra space around comparison operators for assert messages

add extra space around comparison operators for assert messages

The following argument was made in the report of bug #102 to
include extra space around the comparison operator in
assert messages:

When ck_assert_int_gt(1 + 2, 3 + 4) fails, it outputs a string like this:

   Assertion '1 + 2>3 + 4' failed: 1 + 2==3, 3 + 4==7

This doesn’t look nice, since most programmers write spaces around comparison operators.
Therefore, the assertion message should do the same.

   Assertion '1 + 2 > 3 + 4' failed: 1 + 2 == 3, 3 + 4 == 7

For condensed code, it would look like this:

   Assertion '1+2 > 3+4' failed: 1+2 == 3, 3+4 == 7

I think the versions with the spaces look nicer than those without.

git-svn-id: svn+ssh://svn.code.sf.net/p/check/code/trunk@1199 64e312b2-a51f-0410-8e61-82d0ca0eb02a