Headers of simulations
Let's use ESO-style FITS headers to manage our simulations. For example ESO's OBServing block definition to index our simulations. A set of consecutive simulated images with a single simulations set up is then a single OBS. We should use the appropriate fields to store full simulation configuration. Some things are anticipated to come in handy at later stage, for now we can fill in 'TBD' for strings or -99 for integers in those cases.

The header keywords (or eqivalent) to the astrometry keywords (though CD2_2)
are the most important.  The remainder can be added later, but are already
useful.

SIMPLE  =                    T  / conforms to FITS standard
BITPIX  =                  -32  / Bits per pixel
NAXIS   =                    2  / File dimension
NAXIS1  =                 4096  / Size in x
NAXIS2  =                 4096  / Size in y
DATE    = '2010-11-16T01:06:35' / Date this file was written
TELESCOP= 'E-ELT  '             / ESO Telescope Name
INSTRUME= 'MICADO '             / Instrument used.
OBJECT  = 'NOVA-SIM1'           / Original target.
RA      =           150.00      / 10:00:00.0 RA (J2000) pointing (deg)
DEC     =            -30.00000  / -30:00:00.0 DEC (J2000) pointing (deg)
EPOCH   =               2000.0  / Standard FK5 (years)
RADECSYS= 'FK5     '            / Coordinate reference frame
EXPTIME =                 10.0  / Corrected to ndit = 1
MJD-OBS =       55516.04624834  / Obs start
DATE-OBS= '2010-11-16T01:06:35' / Observing date
UTC     =               3994.0  / 01:06:34.000 UTC at start (sec)
LST     =              300.578  / 00:05:00.578 LST at start (sec)
PI-COI  = 'NOVA    '            / PI-COI name.
OBSERVER= 'NOVA    '            / Name of observer.
ORIGFILE= 'MICADO_IMG_OBS320_0013.fits'
CHIP_ID = 'MICADO_SIM_CHIP'
FILT_ID = 'MICADO_SIM_FILT'
CTYPE1  = 'RA---TAN'
CTYPE2  = 'DEC--TAN'
CRVAL1  =     150.000000000000
CRVAL2  =    -30.0000000000000
CRPIX1  =             2048.000
CRPIX2  =             2048.000
CD1_1   = -8.3333333333333e-07
CD1_2   = 0.00000000000000E+00
CD2_1   = 0.00000000000000E+00
CD2_2   = 8.33333333333333e-07
TEL_LAT =             -24.6157
TEL_LONG=             -70.3976
TEL_ELEV=               2530.0
TEL_ZONE=                  4.0
OBS_ID  =               507435
OBS_DID = 'ESO-VLT-DIC.OBS-1.11'
OBS_GRP = '0       '
OBS_NAME= 'MICADO-SIM1'
OBS_PID = '179.A-2004(C)'
OBS_STRT= '2010-11-16T00:45:15'
TPL_CATG= 'SCIENCE '
TPL_DID = 'NOVA-ELT-DIC.TPL-1.9'
TPL_NEXP=                   24
TPL_ID  = 'MICADO_img_obs_tile6'
TPL_INDX=                    3
TPL_NAME= 'MICADO-SIM-observation'
TPL_SEQ = 'MICADO-SIM-seq'
TPL_STRT= '2010-11-16T01:05:48'
TPL_STGY= 'Unknown '
TPL_TECH= 'IMAGE,JITTER'
TPL_TYPE= 'OBJECT  '
TPL_VERS= '$Revision: 0.0 $'
AIRMEND =                  1.0
AIRMSTRT=                  1.0
CREADATE= '2013-10-30T17:18:53.000'
END