Added check for infinite SNRs when making plots in single_pusle_search.py. Cand is ignored if infinite SNR.
Redirected warnings in single_pulse_search.py to stdout instead of stderr.
This prevents jobs from failing in the PALFA pipeline2.0 pipeline.
Replaced 's->clip_sigma > 0.0' condition in zerodm.c with a static int condition that is set to False when not using padvals for bandpass.
Change spectra_per_subint for filterbank input from 512 to 480 so that is divisible by more downsample factors.
Suppressed output of "Set bins ..." in zapping.c since with dynamic zaplists causes a huge amount of text to stdout.
Merge branch 'float_internals' of https://github.com/scottransom/presto into float_internals
Revert "Replaced 's->clip_sigma > 0.0' condition in zerodm.c with a static int condition that is set to False when not using padvals for bandpass."
After discussion with Scott.

This reverts commit 53b0aad86101cbd124bdc83a8ce71150698182f0.
Revert "Redirected warnings in single_pulse_search.py to stdout instead of stderr."
Changing behaviour of warnings should be handled by pipeline, not in PRESTO.

This reverts commit 70d63187f74cd4607710ea18eb071d408c28331f.
Merge pull request #32 from pscholz/float_internals

Small float internals changes.  Thanks, Paul!