Add new plotting functionality to 'sifting.py'.
Add an attempt at making a fancy, split-scale plot.

The better approach for doing this is by creating a custom scale.
Modify harmonic scrubbing to be more exacting.

The tolerance for two frequencies to be considered the same changes with harmonic number.

Also, added information about which harmonic a candidate is to the candidate's note. This information appears in the *.accelcands.report file.
Bugfix: was returning None instead of empty Candlist
Add split log-linear scale for when periods are used on the x-axis.
Fix typo in note for short-period bad cands.
Try to fix coordinates shown in interactive display.
Added support for tempo2 toa generation
Added LWA as telescope in misc_utils.c
added .dylib to .gitignore
Merge branch 'lwa-bugfix' into placeholder

* lwa-bugfix:
  added .dylib to .gitignore
  Added LWA as telescope in misc_utils.c
Merge pull request #22 from paulray/tempo2-toas

Added support for tempo2 toa generation.. Thanks, Paul!
Merge pull request #23 from paulray/lwa-bugfix

Lwa bugfix
Merge branch 'master' of git://github.com/scottransom/presto into placeholder

* 'master' of git://github.com/scottransom/presto:
Improved precision of channel frequencies when reading PSRFITS files
Made sure freq calculation was done as double
Merge pull request #24 from paulray/fix-psrfits-freqs

Fix psrfits frequency determinations
Modify 'sifting.py' to make it less memory hungry.
Add sigma to accelcand hits.

Update output text file's format accordingly.
When checking for DM-too-low in 'sifting.remove_DM_problems(...)' consider the hit with max sigma to be consistent with how duplicates are added to candidates.

Used to consider hit with max snr, but this allowed candidates with DM < low_dm sneak through sifting.