rchecker.py -- switched option s to u for consistency
tofits.py -- first go at a FITS writer

still needs a fair bit of work.
tofits.py -- added window position information

Windows now know where they are.
Raw.py -- docfix and extra attribute for Rhead

Rhead now has the attribute nccd saying how many CCDs the instrument has.
tofits -- 3D option added, option for splitting by CCD

One can now save windows as 3D FITS files, one per window. The frame-by-frame approach can now write out a file per CCD.
setup.py -- added tofits.py to the distributed scripts.