LibSpiro - version Beta_0v4

Main improvements in this release are fixes for LibSpiro to be able to build, test, and install on a greater variety of computer systems. Most edits are between 0.3 and here are to pass through older compilers with less complaints, plus a variety of fixes to "call-test.c" to run across a larger variety of computers (recent issues #9 and #10 fixed and verified).

Thanks,
Joe