Ccplot

* Fix type cast bug with numpy 1.7

* Changed backend back from cairo to AGG (though not GTK AGG as before),
because matplotlib enforces limitation on the number of line points with
cairo to 18980, which is not enough for basemap.

* Fixed numpy include path in setup.py.
* matplotlib is imported with the cairo backend, so that X server
is not required to be running.
* Updated installation instructions in INSTALL.

* Support for changing meridians and parallels through the meridiansbase,
parallelsbase, nminormeridians and nminorparallels options.
* Updated installation instructions in INSTALL.
* Updated information in README.

* Wrong dimension mapping of MODIS Swath near 180E was fixed.
* Missing meridians on polar plots were fixed.
* Projection options like central latitude, central meridian,
bounding latitude and latitude of true scale
can now be set with the -p switch.
* Wrong interpolation radius calculation on Equidistant Cylindrical
plots was fixed.
* Ticks on profile plot are now more dense by default.
* Sufrace elevation line can now be plotted for CALIPSO profile products
(and is on by default).

* The way aspect ratio is specified was changed.
* Vertical extent is now set by -y instead of -v.
* Horizontal extent can now be expressed in terms of geographical
coordinates for swath plot types.
* Tick on trajectories can be specified by the newly introduced
trajticks and trajnminortics options.
* ccplot now checks libraries versions at start-up.
* -V print version flag was added.
* -v be verbose flag was added.
* The way plot layout is constructed was rewritten. Newly added
options plotheight, padding and cbspacing can be used to control
the layout.
* -z options parsing would cash the program instead of failing. Fixed.
* Default output filename now set to ccplot.png.
* List of available projections and options is not printed as part of
the help output, but can be printed by -p help and -z help (resp.)
* Insufficient memory error condition is now handled gracefully.
* Colormap files are now searched for in some default locations first.