libspiro.0.2.20130930

Libspiro, version 0.2.20130930.
Spiro is the creation of Raph Levien, which simplifies the drawing of beautiful curves.
Libspiro is a shareable library that can be used by programs to do the Spiro computations for you.

Improvements you may notice in this release (compared to Libspiro 20071029) are:

1. libspiro will try harder to create curves before giving-up on the really hard curves.
2. code optimizations so that some numbers aren't re-computed (summary, should run a bit faster).
3. A few error checks, such as making sure memory is allocated, otherwise fail gracefully.
4. Checks for inifinte values are done, so that user code doesn't need to test for this now.
5. 2 enhanced functions which return pass/fail. Backwards compatibility is maintained.
6. configure now has options that were only accessible in code earlier, such as VERBOSE, UNITTEST.
7. 'make check' allows you to test this new libspiro before you do a 'make install'
8. tests/call-test.c includes example code that may help developers who are interested in creating programs that use libspiro.