More 0.6.0 updates

[Havoc Pennington <rhp zirx pair com>]

Hi,

Teemu Ikonen alerted me to the fact that Guppi 0.6.0 segfaults in the
scatterplot - I spent hours figuring this out yesterday, but I didn't
realize it was in the release. 

The problem is the -ansi flag to gcc, which removes the prototype for
rint() and results in bad code. 

To fix: 
1) make clean
2) find the string '-ansi' in the configure script, and remove it
3) run configure again
4) rebuild

Also, 0.7.0 will be out later today fixing this problem for real.

Thanks to everyone that's reported bugs or tried Guppi!

Havoc