add mag_exp
add mag_exp_tail
cleanup acb_get_mag, acb_get_mag_lower
change arb/acb_mat_bound_inf_norm to output a mag_t; tweak arb/acb_mat_exp
remove obsoleted functions fmprb_mat_exp, fmpcb_mat_exp
tiny fix
more cleanup
more cleanup
add new logarithm code and fix minor precision issue in atan
small test code fix
speed up log_ui_from_prev
replace makefiles with version based on the improved flint makefiles
configure fix
fix make install include path
remove most of the old (arb 1.x) modules
remove old header files
improve mag_set_ui / mag_set_ui_lower and add test code