Added LWA1 telescope and fixed freq reading precision issue in psrfits.c
Merge branch 'osx-fink-support' of https://github.com/paulray/presto into osx-fink-support

* 'osx-fink-support' of https://github.com/paulray/presto: (38 commits)
  Changes to compile on Mac OS X with fink-installed pgplot,fftw3,...
  Fixed issues with merge with Scott's master's branch in 'sifting.py' that I missed when performing the merge.
  Fixed typo in 'psrfits2fil.py'
  Added support for files with > 4bit values.
  Made more general by not assuming that the 'SUBINT' hdu is the first secondary hdu.
  Continue if telescope or backend are not recognized in 'psrfits2fil.py'.
  Add python script to convert psrfits files to sigproc filterbank format.
  Reduce number of times file is opened.
  'create_filterbank_file' function returns a FilterbankFile object of the newly created file in read-write mode.
  Fix bug where spectra were not being cast from float64 to the appropriate dtype. Cherry-picked only changes to 'filterbank.py' from Patrick's commit.
  Fix function to create filterbank files in 'filterbank.py'
  Check if FilterbankFile is writable.
  Add ability to append spectra to filterbank format files via python FilterbankFile objects.
  Modify 'filterbank.py' to use memmap numpy arrays. Cherry-picked only changes to 'filterbank.py' from Patrick's commit.
  Try to reduce memory usage of 'injectpsr.py'. Cherry-picked modifications to 'filterbank.py' from Patrick's commit
  Add a python module for reading filterbank file.
  Small change to avoid an if gives approx 10% speedup
  Tracking of bad/duplicate candidates is off by default. Added argument to 'read_candidates' to turn it on.
  Made some changes to plot_goodbad() in sifting.py to be compatible with older versions of matplotlib.
  Added handling of plotting zero length candlists in plot_goodbad() in sifting.py.
  ...

Conflicts:
	src/psrfits.c