Aipy

* Added sorting to plot_uv.py to make plots in sensible baseline order.
* Edited script documentation for plot_map.py
* Changed "-a" in scripting.py so that "-a 0,1,2" includes only baselines that
involve these antennas without autos (i.e. 0_1,0_2,1_2), rather than all
baselines that involve any of the antennas. Listing 1 antenna will
include all baselines involving that antenna.
* Fixed combine_freqs.py to work with new numpy masked arrays.
* Made fitmdl.py have a --sim_auto parameter that rejects auto-correlations
by default. This makes fitmdl.py work more nicely with '-a' change above.

* Changed "flat" to "flatten()" in plot_img.py, as per numpy-1.2.
* Made plot_map.py able to function (only for cyl projection) without basemap.
* Added FITS image I/O convenience functions to img.py. Defined standard
FITS format based on VLA images.

* Moved functions from xrfi.py script into rfi module
* Bugfix in array shape in BeamFlat response() function
* Ported to numpy>=1.2. Involved:
- Update flag_by_int in rfi module for new numpy-1.2.ma behavior
- Update miriad_wrap.cpp, healpix_wrap.cpp, alm_wrap.cpp for new
numpy-1.2 API (PyArray_SimpleNew instead of PyArray_FromDims,
npy_intp instead of int for array dimensions)

* Bugfix to source strength polynomials as a function of LST
* Corrected all 3C source postions in src.py using NED.
* Ported to numpy>=1.1, matplotlib>=0.98, basemap>=0.99. Involved:
- use of numpy.histogram with new=True in xrfi.py
- importing Basemap from mpl_toolkits.basemap in plot_map.py
* Split dependency installation into two scripts: install_required.sh
which installs the minimum needed to be able to install aipy and run
"import aipy", and install_recommended.sh which installs matplotlib/basemap
and is needed for most of the scripts that come with AIPY.

* Attempting to support easy_install/setuptools functionality while maintaining
the simple building that already works.
* Feature added to plot_map.py to give (ra,dec),flux of location on a map
when right-clicked.
* Changed how plot_map.py plots to use imshow instead of contourf.

* Added _cephes module (from scipy, cutting out fortran dependencies) which
implements various scientific functions. Needed j1 = Bessel function.
* Moved source-resolution estimator (using symmetric disc approx) from phs2src
into separate AntennaArray.resolve_src(). Changed from incorrect sinc
function to correct j1 (first order Bessel function).