Moved FIT_WTHETA flag into tasks structure
Added readin of n(z) data to wp_input

Also fixed missing semicolon in header.c
Added wtheta_fit as option in chi2_wp function in wp_minimization.c
Alterations to wp_input so that assignment of ngal and wp.ngal_err still works even when testing with COVAR=0
Decoupled n(z) input from wp/wth covariance matrix input
Corrected issue in M2N minimization with M2N_type==2 where not all values needed were computed