Removed singular matrix warning.
Added MATRIX_MODELERR measurement parameters.
Added DURATION_ANALYSIS measurement parameter.

Changed EPSxMODEL parameters to POLARx_MODEL.
Added AMODEL, BMODEL, THETAMODEL for both _IMAGE and _WORLD coordinates.
Added CXXMODEL CYYMODEL, CXYMODEL for both _IMAGE and _WORLD coordinates.
AddedTHETAMODEL_SKY,THETAMODEL_J2000,THETAMODEL_B1950.
Added ELLIPxMODEL_WORLD and POLARxMODEL_WORLD.
Fixed broken PSF-fitting.
Fixed warnings while generating the configure (thanks to S.Pascual).
Pushed version number to 2.9.1.

Replaced configuration error with warning if FFTW is not multithreaded and multithreading has been activated (unused).
Added autoconfig support for FFTW multithreaded versions combined in libfftw3 (unused).
Added runtime warning if ATLAS is not multithreaded and multithreading is on (unused).
Version number pushed to 2.8.8.