Fixed potential issues in ASSOCCOORD_TYPE WORLD mode.

Fixed triggering of model surface brightness measurement.
Added new FLUX_DETMODEL,FLUXERR_DETMODEL, MAG_DETMODEL,MAGERR_DETMODEL, FLAGS_DE
TMODEL and CHI2_DETMODEL measurement parameters that apply on the measurement im
age a model fitted on the detection image (two PSF models required); these new p
arameters are meant for measuring faint galaxy colors.
Improved displayed info for memory allocation failures.
Increased default maximum number of threads set by configure to 1024.
Updated Copyright display line (2012).
Added support for "TPV" WCS projection.
Pushed version number to 2.16.0.